its a bit out of your price range, but i would splurge a little bit and get a dayton titanic, you can get 10"s for 150 bucks.. they take 300rms, and 450 peak. i have them @ 200 rms, on an overrated amp, its the best bass ive ever had in my car, sounds far and away better than 2 x 12" pioneer subs i used to have.
