I'm really happy with my DynAudios, though I'll need to add a sub at some point. And change rooms.

I will no doubt repeat what others have already said. But first, the single most important decision you will make is the near field monitors you use. Everything you do will go through these speakers and all your mixing decisions will be determined by what you hear from them. Therefore take your time and listen to each and every one that you are considering. Use familiar material as the source plus known high quality material that has a full range sound.
 
Pink Floyd's Dark Side of the Moon is great for testing speakers. But don't limit yourself with just that. Bach's Toccata and Fugue in D minor has a very wide range. You should pick a full orchestral piece too. Rhapsody in Blue  or Afternoon of the Faun by Debusy.
 
Listen to the highs and the midrange for transients. The better sounding the transients the more compliant the speakers. If they tend to smear or are indistinct avoid them. 
 
Be sure that you listen to the speakers pointing to you.  Near fields do not have a wide dispersion of sound and need to be close and pointed at the listener. Slightly off axis will provide a poor sound to the listener. 
 
You can't move a lot of air with tiny speakers. Bass response needs to move lots of air thus you need large speakers. 8'' should be the cutoff point for a woofer.
 
As far as brands go I wont recommend any. To me that is a personal decision. Do your home work and you will find the right monitors to fit your budget.    
 
 

wgdevanna
...Mike Senior's Mixing Secrets for the Small Studio...
...but I don't see that it's available as a Kindle edition on Amazon right now...

The Kindle edition has the shorter title "Mixing Secrets".
http://www.amazon.com/Mix...PK/ref=tmm_kin_title_0

...wicked
I've used KRK RP5's for a billion years. I don't have a sub and sometimes miss that since I need to go reference my low end on some other systems before calling a mix "done" but otherwise have no complaints with them.
 
I did my listening shootout at Guitar Center in their closed speaker room with a handful of CDs I know very well (Tom Waits, Massive Attack, and some of my own stuff just for reference). Since it was material I was very familiar with it was relatively easy to determine which speakers sounded the most balanced. I think I tweaked the high-end by 1db once I set them up in my studio.
 

It's often been said about KRK Rockits that you wouldn't play music for clients over them, because they don't make the music sound good...but their balance is what makes mixes translate well. However if anyone wants to check out the Rockits, I would recommend stretching for the 6" instead of the 5" if possible. The extra inch makes a significant difference in the low end. The usual disclaimer (KRK is owned by Gibson Brands) is also joined by the disclaimer that I've had experience only with the Gen 3 models.
 
Obviously there are lots of good speakers, and the ultimate decision about what works best for you is a variety of factors including price, intended function, the genre of music you do, etc. Back in the days when people had hi-fi setups, I actually had two sets of speakers and a switcher - KLH for rock, and Avid (no relation to the Pro Tools company) for classical. Both were excellent for what they did, and not that great for what they didn't.

''the genre of music you do''
 
Mr Anderton; I've read or heard somewhere that whatever the genre of music you do, it shouldn't have really any impact whatever the speakers we're using...??? Who's wrong who's right?
 

HELLYA
''the genre of music you do''
 
Mr Anderton; I've read or heard somewhere that whatever the genre of music you do, it shouldn't have really any impact whatever the speakers we're using...??? Who's wrong who's right?
 

I have problems with that statement too. I strongly believe that speakers should be as flat as possible and as uncolored as possible. This should mean they play everything equally well. What you want is reliability and detail. It shouldn't matter what you are playing through them. Monitors are a little different though, mainly because monitors are by nature small. Plus the dispersion is very limited. Different genres may do better on one and not on another. Supposedly the closeness of monitors may make up for short comings in the low end output but one runs into the long wave of low frequencies. Being so close its hard to see how they can really provide a good low end. 
 
Most small monitors have tuned ports of some sort. This also means a very small range of low frequencies will be emphasized and others not. Again some genres may benefit from one design over another. In the end I think Craig is right about monitors in a general way.  If you apply that to speakers in general I would disagree. 

I think the best "bang for the buck" are the KRK Rokit 8's... I added the 10 inch sub last year.  Also use the krk kns 8400 headphones, which are dead on flat and very comfortable.  
 
Would love the VXT's but I keep upgrading other elements (DM-307, GD-6 just this week...Luftdrum11 for Diva this morning...wow!) as tools are the meat of my creations and I've found the Rokit 8 mixes in my modest 12x28 ft. cottage translate pretty well to the real world now that I'm getting better at mixing...
 
Got fantastic deals on all of them at Guitar Center... better than any "on-line" price at the time

Well, well for metal genre then...is there a any suggestions? What should i look for?
 

HELLYA
Well, well for metal genre then...is there a any suggestions? What should i look for?
 

Headphones, for everyone else's benefit.
 
Only joking..
 
I have a pair of 2nd Generation Rockits, and really like them.  I wouldn't mind adding a sub at some point as I, like others have mentioned, have to check my mixes elsewhere for the bass.
 
I will just add that it is worth budgeting for room treatment at the same time.  I can't remember if it was Mike Senior or Roey Izhaki who suggest spending the same amount on room treatment as you spent on your monitors.  It makes a HUGE difference.

HELLYA
''the genre of music you do''
 
Mr Anderton; I've read or heard somewhere that whatever the genre of music you do, it shouldn't have really any impact whatever the speakers we're using...??? Who's wrong who's right?

Some genres of music place more value on some attributes than others. For example, if you're working on dance music or hip-hop, it's really crucial that you can hear what's going on in the bass frequencies. Some speakers which are otherwise quite accurate and have a "sound" you like may have a low frequency bump. That won't make a difference if you're mostly doing singer/songwriter material with acoustic guitar, but you'll mix the bass "shy" for dance. 
 
Ideally you want speakers that are flat but if you look at the frequency response curves for speakers, there are differences among them. If you're conscious of these differences, you can choose speakers that more closely match your needs. As two more examples, I know that a lot of hip-hop producers use KRKs and I asked one of their specialists why. Apparently it's because they feel the bass translates particularly well when they mix on the KRKs. Pop music people loved NS-10s because of the midrange bump; there's a really clear explanation of this in the review I linked to above.