Before you get any flames, I'll jump in and suggest the FMR audio RNC. It's very nice, except maybe on bass. It is stereo, can be used for mono signal (but not independent dual mono signals), and is very higly recommended. Nice and transparent. Not as flexible (ie. not as many knobs and lights) as other cheap comps (behringer and the like), but sounds better. Not really able to act as a brickwall limiter. US $175.
This is a good deal.
Steve
P.S. Someone will tell you to use the search function