don't bother, the speakers are crap panasonic ones, the head unit has very poor clarity and the tweeters are cheap. best off going all at once, aftermarket head unit, alpine, pioneer, blaupunkt any of those are reasonable units for price. if you want to go all out you could go nakamici or something but I hardly see the point unless your going for competition. some good quality 6.5" splits in the front (boston as you said are fantastic, the Z6's or pro's would blow over anything ford can provide). could go dyn's, morel, boston, SS, depending on what sounds good to you. amps well you can go for anything as theres so many choices whether you want to run the fronts passive, active, have a seperate amp for the sub etc etc. the sub you should be going for a single 10 or 12". boston G5's, IDmax 12's and Treo's seem popular at the moment though I've never used any to have an opinion. best thing you can do to a car for more mid and low end is deaden and seal the doors, I did it in my old XT and it made the stock speakers sound remarkably better. lastly the BA's have a common issue of getting induced noise through wiring so be careful where you put components. try keep crossovers and really any wiring at all away from behind the kick panels as theres alot of wires running there and it's a known cause of induced noise. good luck Rhyso