Look for a good deal on some Alpine Type-R's. Got mine off ebay for 80 a piece brand new, and at that price I don't see a better option unless you buy used. I have two tens, sound really clean. Whatever you do stay away from Xplods. One of the worst subs on the market, don't let anyone tell you otherwise. And btw if you get any Alpine sub, do not under power them. They're power hungry but they can take the abuse.