I have a 2002 Cadillac Sts, and i'm looking to put a system, i already have a stock 12 inch sub in the back that's shot, and I'm looking to replace it and expand off of that, new speakers, amp, etc. But i also have an older head unit (touch screen, navigation), but it seems to do the job, I'm thinking of possibly replacing that, but I'm not too sure yet. Anyone got any ideas?