Autumn...........

My opinion, but -- I think getting the car you want and making sure that this car has the "premium" sound system (if offered as an option) and then adding a nice powered subwoofer is all you will need.

I've done this with 2 cars and the sound was every bit as good as another car where I installed a full-blown, kick-ass custom system.

Usually, the manufacturer's audio systems are decent for mids and highs but weak on the lows -- thus, add the sub.

But, you also must know, I'm a bit of a bass freak !