The ongoing debate, 10s versus 12s. 10s will be more responsive and tighter, 12s will be lower and louder. What are your goals here? Basshead, go 12s. If you want more of the punch you in the chest quick response like for techno or metal or something, you want 10s. Plus, you've got a small car, and 10s will require a smaller box, so that's a plus.