[CarolinaE36er]

I went with a 10" sub from eclipse, paired with an amp from Xtant. The sub is 500 watt rms max (1000 peak), with a 150 rms amp (300 peak). Its a pretty nice sub with excellent response and hits pretty hard. I got the eclipse because of its reputation, but more because I got it for an incredible price (local car audio shop stopped carrying eclipse). If you're looking for an awesome sub, go with a JL, they have incredible subs. The kind of sub you're going to get depends greatly on how much you're willing to spend. You can get a pair of Fosgates and an amp for pretty cheap, and they'll be loud, but not as accurate & tight. If you're going to get an expensive Sub, you'll need a nicer amp to go with it... if the amp has distorsion your sub wont sound good anyways. You'll need to do a lot of reseach before jumping in if you dont want to end up regretting your purchase.