I personally like Ircam Verb Session (from Flux Home), and Waves IR-L, although the former is still only 32-bit. Ircam Verb is a monster, but expensive! Verb Session is much more economical. Waves IR-L is great as a convolution reverb, but I don't believe the Waves IR-1 is worth the money. I'm still looking for decent reverbs. I tried Breverb: It's nice to have as a bonus to X2, and easy to use.