http://www.sonicelectronix.com/item_9238_Pioneer+Premier+TS-W3001D4.html
Pioneer W3001D4 1000 rms
http://www.sonicelectronix.com/item_9388_Power+Acoustik+MOFO-12.html
Power Acoustik Mofo 1200 rms
I can say these right off the bat because i'm looking as well. Check out sonic electronix though, they have some prices that beat the hell out of buying subs from the store. Good luck, they both have good reviews and are within your price range.
also i have ordered from onlinecarsterio.com, also a good site worth checking out