You won't get nice bass out of door speakers imo, especially without an amp.
To get clarity and depth out of speakers you need an amp, most aftermarket headunits even expensive ones still don't have enough umph for good speakers.
In general I agree.
But to be different, I have pioneer yellows components up front, 6" 2-way up back and pioneer RS-80 head unit.
Tricked a few people into thinking a 10" sub was in the boot when they listened because those front speakers are awesome.
It'll never compare to the twin rocky 12's in my last car, but then again I'm not after that in this car.
OP sounds like he will need subs to achieve what he is after, I'm just saying with top range stuff it is alot better than cheap stuff.