im not sure what amp is the best but i can tell you a little story about a phenoix gold amp...

ok im the back of my friends civic coupe driving across the bay bridge (at this time he had 2 12" kicker subs and a phenoix gold amp which was attached behind the seat that i was sitting on) So we smell smoke and i see smoke coming out of the rear speakers. Im like what the hell i think there is smoke coming out of the speakers, so coincidentally he had a spare key in the glovebox so i opened up the rear seats only to be greeted by a backdraft like flame, so i closed the seat and we got off at the next exit that we could. We go into the first parking lot we see and a guy comes running out of a booth saying we cant come in there, so we open the trunk and flames start goin everywhere and he lets us put it out before kicking us out. I guess the fans on the amp malfunctioned and it got too hot. Moral of the story is that phenoix gold sent my friend a new amp free of charge so i guess that they have pretty good customer service. Just thought id share my story