I'm looking for any type of ideas for changing up my sound system. I have a '97 A4 with I beileve the Bose system installed. No 6 CD Changer (which still might be something I want). If I was to change them I'd go with just one company, not mix & matching. What kind would anyone suggest. Plus I don't know what sizes the front middle & rear deck size are I think 6 1/2? I'm not looking for anything insanely loud, but everyday driving. Maybe one 10" sub. Thanks for any response.