I really like the Fromel Velvet Vice compressor. http://fromelelectronics.com/pedals/Velvet-Vice Really clean and transparent, but very quiet and effective.
I'm getting ready to sell all my pedals since I have an amp that longer needs them, including the VV.
PM me if you're interested.
I haven't tried the VV, but I'm a big Fromel fan. It would be hard to go wrong there.
If you're not in need of "big" compression, it's also hard to go wrong with the Bearfoot Pale Green Compressor. It's the only compressor I've ever used that winds up being "always on," because I can always find some to make it improve my sound no matter what the sound is. It's amazing that way.
And I've owned the Demeter, the Diamond, the Pigtronix, the Analogman Bicomp, and others.