I got this amp a few months ago:
PowerBass ASA1100.5x (asa11005x) - 5-Channel Car Amplifier/Amp - Sonic Electronix
Until the 80-90 degree heat wave this week (and its only getting hotter!), i was in love with it. Now it overheats after about an hour of loud usage. My previous amps were fan cooled so i didn't have this problem. Im gonna find a way to mount some cpu fans (yay for computers being 12v inside!) or something else to the move air around the heatsinks, or just give my ears a treat and not blast the music 24/7.
I still totally recommend it, its got awesome power output for its size and price! And it has a switch to select how many channels your using for input.