Recommendations for a car stereo set-up?

Been through the sound off stuff.A pair of thin mounted 5 1/4s sound much better cheaper than 6 by 9s in the back.If you crank it,6by 9s get nasty.IF YOU SPEND SOME CASH,6by 9s get good.Damn hard to beat seperates up front,depends on what media and music you listen to.