6x9s can produce what your looking for but you will always be wanting to try a sub.
getting a HU should be first, they can make a huge difference.
personally not that great on 6x9s i know a few good brands from the SQ guys but they are pricey, and those are Image Dynamics and Focal
personally i'm still running the stocks, only the front the back is all deadened. For stock i can't complain most people think its aftermarket (i've played with the HU alot)