If you did not tried this one out yet but are looking for an absolutely clean and transparent compressor then do check this one out!
The TDR Feedback Compressor II is a major design update of its critically acclaimed predecessor. The compressor is dedicated to the highest fidelity stereo program (2-buss) compression, but shines equally in classic mixing tasks. – Fabien from TDR
It features detailed control of compression behaviour, extremely low distortion and it’s compression is almost “invisible”. Download the freeware over there at tokyodawn.net.