you have way too many speakers, i'd drop the 6x9's and the rear components. maybe add a set of coaxials in the rear but you can get away with only using them when you have passengers in the car. next either drop the woofers in the door or use the 8" as a dedicated midrange in a 3 way setup... if you go with an 8" in the door make sure you spend a lot of time and money on dampening the door so it'll get the most from those drivers. Look into a good quality 3 way set up with 8" woofers (i.e. dynaudio) you could get away with going active as well and saving a grip load of cash. If this were my car i'd look into a 6-7" component for the fronts, a single 12 or pair of 10's in the rear and coaxials (maybe) in the rear. keep it simple and you'll have a lot better sound quality. actually if you want to hear my exact setup in my s40 it's being built with a vifa tweeter, a 6.5" phaze mid and a 12" tc sounds woofer. no rears and powered by a single 5 chan amp. this isn't over the top by any stretch of the imagination but it should deliver great sound.