ditch the 6x9's they sound awful unless individually amped and will rattle with everything stripped out.
get a decent set of components amped up front, and that should be all you ever need, could go for an "active" set up, 2 amps, one for each side, will sound way better than any 6x9s can offer
http://caraudiosecurity.com/shop/product/products_id/6693.html
mounted on some MDF rings in custom door pods (not hard to do) and a bit of sound deadening in the door to stop the handles etc rattling, it will sound mint,
do you run a sub? if you run a sub one of the worst things you can do is run 6x9's, and they are mainly used for filling in the rear for passengers to be able to hear etc, no t needed if you only have front seats