Betabugs' "monstachorus" is a great chorus (and free!)
I have all the amplitube2 stuff (Hendrix, Ampeg, original, no Metal - not my style) and they're incredible. I got into em in a group buy esoundz had a while ago, but there's a couple great deals straight from IK right now - best thing you can do for your guitar tone, imo. Blending some ampeg to a DI bass track is phenomenal. Same with layering a vox with my real-life twin reverb, or any combination of real and fake (and all fake sounds great, too - just use cabinet impulses instead of the built-in cabinets, and it's a killer tone, all around). I use LAConvolver on the mac to host my cabinet impulses (again, free).
For reverb, the amplitube reverbs are sick, but I also picked up Classik Studio Reverb in the same group buy, and I don't care if I ever get any more reverbs. With what little reverb gets into most styles of music, I can't tell a difference, and for more exposed parts that really "feature" reverb, the CSR hall and plates just kill. For the money, it was easy between this and something like Altiverb (very beloved around this forum, for good reasons - very realistic, and the orchestral crowd is practically all using Altiverb.)
Tremelos are a personal thing - the amplitube stuff is really nice, but if I want a very exposed "just perfect" thing, my twin reverb has the best tremelo in my house. I just did a track for a guy the other day, doing a sort of Bonnie Rait (sp?) slide thing with tremelo, and in the name of speed and tweakability, we threw up amplitube 2, used a really clean fender with the tremelo pedal, and it was gorgeous.
Amplitube will getcha so very very close for all your needs for effects (I have presets with no amps, just pedal and rack effects for that very reason - to use with real amp sounds). Alternately, there are great free plugins that I use all the time - monstachorus, the AUMatrixreverb (built in to all macs) on highest quality is great, and a ton of more creative effects are out there. Hope this helped. I got really wordy
In Him,
Matt