I noticed u were quick to give brands (and some models) of the other stuff BESIDES ur HU....that means u're prolly not happy with it anyway and with good reason...if u don't have a good strong clean source signal to start with, no amount of amplification or processing is gonna help u
if u have the $$ u can consider this
http://trinitun.webberz.com/forums/viewtopic.php?t=45348
6 RCA type 4V preouts...reads CDs, MP3s and WMAs...time correction (to compensate for differences in firing distances between ur various speakers and u)...bass engine and media expander...real real nice HU there meng...
I'm running the Alpine CDA-7894 with no complaints...only mines can't play WMAs but it's not like I care anyway