There should be a 1001bd floatin around on this forum for $150...I'm using one, and I love it. Buying it new is a not so good choice, but for $150, you can't go wrong. Does 1600+ @ 1ohm bridged. Pretty efficient, and pretty clean sounding. I would get the little bass remote thingy (more like a subsonic filter control) if you got the amp.
If you are buying new, I would get the Audiopipe, or an MB Quart Discus 1500.1