If you can find a way to steal some JL audio subs from someone, those will be the best you can get, but good luck even finding someone to jack those off of
I would suggest some Polk Momos, but thats a biased suggestion as well. I really dont know what would be the best sub, perhaps a visit to your local car audio store will help. They should be able to give you a good direction to go in, my general knowledge leads me to believe that anything from the new Kenwood DB+ series, JL audio, MTX, Polk Momo, and if anyone else has some good subs throw em out there. I currently have a mtx system runnin two tens at 400watts each which give a pretty good punch, until I can get an amp to power my Polks, or I may even just add the polks in and run 4 subs, but that would be 2000watts, but I guess since I drive an alero thats the best thing ill get out of the car right? GOod luck :thumbsup: