if it's dual 2 you should get an amp that does around 1200w and there are lot of models:
Ed nine 1 Orion 1200d RE 12.1 kicker 1200.1 viper 1200.1 hifonics 1206(new model is better rated) audiobahn 1300 hct(not the best, but not the worst) MB quart RAA(1000w rms)
I heard a 15" L7 powered by a Kicker SX1250.1 and it was loud as BALLS! It rocked on every pair of 12's I've ever heard. Now, this was in a brand new Envoy, fully dynamatted with an upgraded alternator and 2 runs of 0/1 gauge wire, with a really nice box made for that sub. So this was probably just about as good as you could possibly get one to sound, but it was so loud that I was having a hard time inhaling a breath of air, because the subs were trying to push the air out of my lungs, hahaha.
then ill sell ya an orion 1200d for $250 which will put 1200 watts into one ohm, which is loud from my experience with hearing them, but if you get two, then your dealing wiht a 2000 rms amplifier and thats goin to be some money..