quantum audio, I always had good luck with them.

i was running a 1500D at one time, on two 12's (quantum) in a mustang, played for HOURS and no problems for two years, through massive abuse and at the limit.

I maxed the amp out, and still the subs could hold more, eventually that amp did die, but after two years maxed out, playing for HOURS straight.

I then bought a 1800D, and that was 2 years ago, sold the car and the sub/amps are still going.

I also had good luck out of the older Vibe amps, and dad swears by Rockford Fosgate.

http://www.quantumaudio.net/