I hate the fact of having spacer's so i am biteing the bullet and selling my 6x9's to get some 6" speakers. Thats just my view i think they look goofy.
Thats the best way to do it. 6x9's are a bit of a waste if u have subs, and its not worth the effort of fitting them. just put a decent set of 6'' in the parcel shelf, that way u can just take the stock ones out and put the new ones straight in! and splits in the front doors.