the new cerwin vegas get loud if thats what your looking for you could also look at phoenix gold RSD's or two mach 5 audio 15's if they will fit in your car
well here are some subs you may like. Kicker L5's or some diamond D6's if you would bump the wattage up some i would go with either Diamond D9's. or you can go with my personal fav sub Kicker CVX im a kicker boy myself. i have alot of differnt model diamonds and kickers and these subs i just listed sound awsome. hope this helps.
12" kicker l5 are 600 rms and 1200 peak which if you had 2 of em it would be 1200 rms and 2,400 peak. and the diamond D6's are the same wattage as the L5's the kicker CVX is 1000 rms and 2,000 peak and the Diamond D9 is 800 rms and 1600 peak.