My KJ has been running an aftermarket audio system for about a year now after I blew out the Infinity speakers twice (don't ask). I have a Kenwood receiver and Polk Audio DB650's in all four doors. However, I have no amp and it is embarassing to say the least right now. I am not planning on installing a subwoofer (yet) but I would like to amplify the system to get some bass and power out of my system. Do I need a 2 channel or a 4 channel? Also, what power should I be looking for?