Originally Posted by Rock~1

well boogers got most of it, make sure you know what kind of music you want to listen to. ex 15" subs are going to be heavy therefor are going to take longer to recoil therefor they would not be as good for techno or rock as 10" would be. again it all depends on how much your willing to spend, i have a $4000 audio setup in my Sol. but maybe that to much for you, you only want to spend a 1000 or less. personally i beleive your better off spending a good amount on your speakers and spending whatevers left on the subs. just because you notice the difference in voice quality compared to the din of a sub. like boogers said the cheap way to go with an amp is a 4 channel bridged to the fronts and the subs. run the back speakers off the head unit, you wont hear them much. good luck and let me know what you end up doing, always like to see what other people have.