I live in a rural area and do have much access to sampling good audio. I installed a 3 way component CDT HD 642 powered buy an avionixx amp bridged for 220rms/side in my 370z with a IDQ 12for the low end. I really like it but while it sounds really clear it isn't very loud. I bought it this way on purpose but I want a LOUD system in my other car. It is completely gutted 95 Nissan 240sx. It was a former drag car with a chevy 350 in it. I won't be able to drown out the engine noise but I would like to be able to hear some music.
Right now I am thinking about a Sundown SA-12 where the back seat used to be possibly a 15. I will have to build the box inside the car because of the 10 point roll cage. I don't know just how stong the alt. is so I am going 1000rms for the hole system. I don't think I can justify much over $250 for a set but cheaper wouldn't hurt my feelings. I was looking at some the prices on woofersetc and there is still quite a selection.