GuitarSuite rocks...kinda pissed it's PC only though. I used it alot when I had a PC for recording, but now I'm all Mac so I'm missing that plug. Also, Line6 is releasing a VST version of it's XT models, should be kinda interesting. There is also Amplitube2, which I haven't used but I hear it's a lot better than the first one which sounded like cardboard. There is GuitarRig by Native Instruments, and Waves GTR. And there is one or two I think by Voxengo that get ok results.
You have to expect absolute crap from any of these though, because when it sounds kinda alright, you won't feel so disappointed. If you expect it to sound great, you'll be disappointed...kinda some reverse psychology there haha.
Good luck!
~e.a