Yes you can find better on Ebay. I will post back in a few with some links to some pretty good stuff in the price range you are seeking. Personally I would just go with 2 10's that is what I have in my setup. They give you more than enough to feel the beat, but wont kill your brain cells either. Also they tend to fit more nicely in your trunk than 12's or 15's would.

But that is just my opinion. Everyone has their own taste though