Personally since i like all audiobahns stuff i would go with an audio bahn Ultra excursion series sub... Most of the guys here will tell you to go with xxx's and ED's and RE's which i think are somewhat in your price range. the audiobahns are 2ohm DVC speakers which would let your take advantage of the 900w @ 1ohm and those speakers are 900w rms and can take alot of punishment, oh yeah and they sound good for rap too.. if installed correctly.