(If you buy TH2 from the Cake shop for $99 you get TH3...)
Really? If that's true TH3 may be tempting.
 
From the other TH3 thread it would seem it's not playing nice with Sonar.

I've been playing with the Demo of TH3 and I'm just not
won over...it's ok...some tones are great...others...eh...
and to me, they still sound "boxy"...like they were recorded
in a box...granted it's not unusable...but kinda grinds at me...
and the mic adjustments are hit and miss...they just don't 
behave like moving a mic around....

S Gear wins hands down for me when I play my Strat. I tend to lean towards A4 when playing my ES 335. I think a lot has to do with your rig. My Band mate gets excellent tones out of TH2. Therefore I would advise demoing them first.

I like the GUI on the new A4 the best of the SIMs I own and have tried.

S-Gear is my go to amp sim for tone/responsiveness, etc. I keep GR5 around for the fx, but don't use it that much.

I have a number of sims and S-Gear is the one I use the most.

+me likey too.

My favorite by far, though I do use Kuassa Creme for metal/leads occasionally.

S-Gear is hands down the best piece of software I own. It works with real guitars and virtual vst guitars. I own many amp sim programs and like them. I LOVE S-Gear!

Thanks for all the feedback. Much appreciated.

I've got A4, G Rig 5 with Rig Control board, Pod Farm 2 with a XT Live, and TH2 full.

When I demoed S-Gear I had expected to be blown away, but I wasn't. It does a fine job, but it still sounds like an amp sim to me.
 
It may be because I'm not big on heavy distortion. I'm usually after just enough to get the desired sustain, as opposed to the sound of a ripped speaker cone with thumbtacks in it. Think Mark Knopfler as opposed to Edward Van Halen. Anybody had success achieving that kind of sound with S-Gear?