Waves compressors are pretty good. I like the L2 limiter and the c4 multiband.
Not a huge fan of their single band c1. renesance vox (sp?) works pretty well on vocals and can be used in other applications as well.
as far as single band compression I am using VC 64 in sonar and I love it.
It's made my Kjaerhus audio and they have thier version for sale. It's a channel strip actually. I believe that the Kjaerus version is the GAC-1.
The have some nice free stuff at thier site as well. The classic series is all free and worth getting for sure.
Really you ought to be able to get good results with the waves stuff.
F.S.