Your favorite FX audio plugs?

I got some great advice about getting to know your plugin's well. 
That just feels like the right thing to do. 
Considering the hundreds of plugs, there would be many years of trial and error before one settled down to a few reliable favorites.
It would help a lot if folks named their top few plugs and I could forget the rest for now and focus on learning those few well, even if I had to buy the odd one.
I assume the basic types would be a couple of types of EQ, Compression/limiters, reverbs and delays rather than the more niche coloring agents such as flangers and chorus.
I'm guessing it would also depend on the instrument. (Vox vs bass vs keys etc) or if it's on a master or other buss but that would be good to know too.
These are not editing "tools" but FX. EG not V-vocal or AudioSnap etc.
I really appreciate any hints.
Glenn

EQ

I still like using the Sonitus, but have started to use the one in the Pro Channel recently.
I like the sound of the LP64 but it doesn't get used much due to the buggy GUI
I have a couple of Pultec emulations which get used for specific tasks
For mastering I like the T-Racks Linear Phase Multiband

Compression

Again, the Sonitus gets used a lot because of it's ease of use and it gives me just what I need in terms of graphical feedback & sound
Pro Channel PC4K S-Type, PC2A T-Type, PC76 U Type all get used regularly
I also use a couple of T-Racks singles both on tracks and busses

Limiters

Concrete Limiter
T-Racks Brickwall Limiter (awesome plug)

Reverbs

Pantheon
Perfect Space
Epic Verb

Delay

Sonitus

stage setting - because it helps to know what might influence someone's choices - I started recording in the mid 1970s to 8 tracks, we had four compressors, one parametric equalizer, and a plate reverb. I love the UAD plugins - they remind me a lot of the gear they emulate, and I'm really familiar with much of that gear. Next up, PSP delays are my favorites. They just sound great! I have a couple compressors from Voxengo, and all their freebies. I wish I could afford more of their stuff! I have the Waves Native Gold bundle - their sound design tools are the best I have, and the rest of their stuff is often useful. If I didn't have the background I have I might prefer their compressors and equalizers over the emulations... they are good, just a little more application specific for me. I have all the Kjaerhus stuff, and I'm really going to miss it when I can no longer make them work. Their compressors are second only to the UAD stuff. I only have the Izotope stuff that came with Sound Forge, but I have to say that their multi-band compressor and mastering reverb are just plain musical. I plan to purchase the entire suite when I can. Soundtoys native - these are effects, but they are the deepest effects I know of. It's absolutely amazing what on can do with these! AudioDamage - I used these at a friends studio, there isn't a bad plugin in the bunch - they took me down paths I'd not otherwise have ventured. These are also on my to-buy list. I'd love to winnow my list down a bit, but really, I use them all, though some more frequently than others. Not ready to let go of any of them, but not looking for anything new either, except as noted above.

As in the free Izotope Vinyl?

SplineEQ : http://photosounder.com/splineeq/ use it mostly on master bus. Density mkII by Variety of sound : http://varietyofsound.wor...y-mkii-released-today/ use it on master bus. Tapebus and Impulse by Voxengo : http://www.voxengo.com/product/analogflux/ use the tapebus master bus as well as tracks, the Impulse is an Impulse reverb use it on Reverb bus. IK Multimedia Classic Studio Reverb :http://www.ikmultimedia.com/products/csr/ on reverb bus. AnalogDelay by Smartelectronix: http://mdsp.smartelectronix.com/analog-delay/ of course on delay bus.

excluding PC... stuff by PSP , fab filter , camel , fxpansion , ozone and the IK tracks etc stuff. is nice of course.

I like the T-Racks series (Opto Compressor, Vintage EQ, Vintage Compressor /EQ Model 670,& Brick Wall Limiter) I use them as individual plugs on tracks.
Voxengo series ( Elephant, Voxformer, Curve EQ, & Soniformer
PSP Vintage Warmer 2
BBE Sonic Maximizer

Peace

I want to give a shout out to Valhalla Room Reverb - the best $50 I've ever spent.

+1 for ValhallaRoom, Ozone and FabFilter everything. 

Lately I've been having a lot of fun with Valhalla UberMod, but I haven't used it long enough to justify promoting it to "favorite" status. But it is a very fun plugin.

Redopter from D16 Group is my first-call distortion plugin for drums. The free LoudMax is my favorite drum super-squasher.

If you can live with 32-bit plugins, and you can find them, the old Kjearhus Classic Compressor and Chorus are two longtime favorites.

And don't forget Voxengo SPAN! The most useful freebie ever. While you're grabbing freebies at Voxengo, don't overlook another oldie but goodie, Boogex. I like to use it to dirty up bass guitar parts.

Of the SONAR-bundled effects, there are only three that I use on a regular basis: PerfectSpace, Channel Tools and the Sonitus Delay. The latter has some annoying quirks, but I've yet to find a suitable third-party replacement that's as easy to use.

Other than Pro Channel, really liking the tone boosters stuff.

a favorite little swiss army knife vst is Korg's MDE-X.  I don't even think they sell it anymore.  It must have over 50 fx, including reverbs, delays, modulations, panning, vocal, compression... prob not as high quality as higher end, newer vsts, but a great program.

Great! Lots to explore here.
Thanks so much for the suggestions
 I've been making notes hoping that one or two of each type would jump out at me but it looks as if folks here are more diversified than I expected.

I love the Fabfilter stuff. EQ, Comp limiter and Saturation plugins

All my Voxengo stuff is in:

c:\program files\cakewalk\vstplugins\voxengo

You can take a look and find where they are scattered and create a Voxengo folder wherever you put your VSTs and copy them there, just rescan at Sonar startup if your sonar isn't already set for that.  ; )

Thanks that worked.