I am looking for some  studio monitors on a budget. any suggestions.SO for I thought about the Mackie CR 4  and the  Mackie MR5 MK3. I want to get a decent mix for cheap. I have the M-Audio as 30 speakers and the left one is very silent now so I need to replace soon.
 

There are plenty of acceptable monitors out there for < $500 a pair.
 
Four pieces of advice:
1. don't buy anything with less than a 6.5" woofer
2. get some solid speaker stands
3, set aside $50 for a good book on acoustics before investing heavily in speakers
4. definitely don't buy a subwoofer until after step #3

I have a pair of Mackie MR5 MKII.
I like them a lot better than the old M-Audio I used before that.
They're not high-end but they're solid and reasonably reliable.
 
Speaker stands do make a difference. 
Room treatment too - a lot. 
 
I don't feel the need to replace the Mackies but I certainly want to invest more into room treatment in the foreseeable future. The part I've already done has made quite a difference.
 
So, yeah - Mackies are a good choice. Maybe just not the little CR though.
 
 

Don't make my mistake and buy monitors that have a real rubbish response below 60Hz.
 

bitflipper
3, set aside $50 for a good book on acoustics before investing heavily in speakers
 

It is this that has stopped me from even bothering with setting up my Tannoy Reveals (which are crap anyway).
 
Placing speakers and treating a room is an absolute nightmare in my opinion... If I had the money then I'd get a "pro" in to set up my studio for me.
 
 

Equator Audio D5, $400 the pair, incredible sound (especially its sweet sweet mids), can't go wrong really. You'd want to add a sub if you need freqs below 50Hz, otherwise you could splash out a bit more and get the D8's for $750 the pair. I haven't come across a genre of music that isn't an absolute pleasure to listen to on these (especially paired with ARC2). I have mine in a completely untreated room, on a shelf near the corner. Possibly the worst setup imaginable, but with ARC2 enabled music sounds more balanced, focused and open than many expensive audiophile systems I've heard. 

synkrotron
 
 
 
It is this that has stopped me from even bothering with setting up my Tannoy Reveals (which are crap anyway).
 
 
 

I like mine...

jamesg1213
 
I like mine...

Yeah, I like the look of mine... and even the sound, but I was gutted when I discovered that the response drops off quite badly below 60Hz.
 
I've given them to my son now and he's using them for his computer monitors. He likes them too

synkrotron

jamesg1213
 
I like mine...

Yeah, I like the look of mine... and even the sound, but I was gutted when I discovered that the response drops off quite badly below 60Hz.
 
I've given them to my son now and he's using them for his computer monitors. He likes them too

I hate everything below 60Hz, anyway....
You could even make that 80. 
 
Music died when it started hiding in the basement. :P

Rain
I hate everything below 60Hz, anyway....
You could even make that 80. 

A very good point Rain

"I hate everything below 60Hz, anyway...."
 
You only have 3 strings on your bass guitar, Rain?