IGS Audio is a Poland based company known for making great gear just announced their brand new 500 series S-Type Buss Compressor. I'm going to see if I can get my hands on one of these units and put it to use on this project I'm currently mixing. I like the fact that all the controls are stepped which makes it very easy to do a precise recall if needed.
Double space unit,
All stepped manipulators (exc. Mix),
London/New York modes,
20 points GR LED bar,
Low power consumption,
Affordable price, 495 Euro, exc. VAT. (approx. $650 USD)
If you don't already have 500 series rack consider their 10 slot Panzer 500 power supply:
The website states it is fully compliant with any 500 series modules (Output current is 420mA per slot).
Cost: 645 Euro (approx. $848 USD)