from Ovnilabs/Bongomania:
"For rackmount, the Rane DC24, dbx 160X/XT and 166, Ashly CLX/DPX series, Symetrix 501, Aphex 661/651, JBL 7110, and FMR PBC-6A are all excellent."
also
Compressor Reviews Tube/Valve Compressors
I use a Rane DC24 and like it a lot. No tube in it and no real personality or 'effect' so to speak. It's a VCA controlled compressor. Split band capability with variable crossover, or may be used as a two channel dual-mono/stereo compressor/limiter. Has expander/noise gates on each channel too. Attack and release is program dependent and automatically controlled, which I though might be a weakness. But after getting this unit, this seems to work as claimed, and seems to work just right with bass, (no pumping, dipping, ducking and all that). The gain reduction lights work well to show you where you are in adjusting things. And even though these have been discontinued now for a few years, they come up often for sale in the typical places, for about $150 or less.
Rane DC24 http://www.fullcompass.com/common/fi...ne%20specs.pdf Guitars: DC-24 by Rane | Harmony Central