For 650 i'd be looking at rainbow profi's...almost to vanadium cross territory there, or, you can try saving ~300 more and going with some power line cs's if you can accomodate them (they are 96mm/3.8 inches deep and use the same motor/basket as the vanadium 7" subwoofers //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif) - so you don't have to upgrade again... Assuming you have already deadened the **** out of your doors. If you haven't deadened your doors, don't spend 650 on components //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif