i have 2 12" rockford p2's in a 5hitty box (R/T) and have more bass than i know what to do with. i actually have to turn the bass halfway down because you cant even hear the song if i turn it all the way up. some people dont like rockfords and thats their opinion. i dont like MTX that much except for their jackhammer (its a 22" woofer that weighs 370Lbs for those who dont know).
http://www.mtxaudio.com/caraudio/pro...jackHammer.cfm
and can be seen here.
as for head unit all i can say is dont get a sony!