for good clean crisp bass i recomend JL audio m8 i mean u just have to go to a soundoff to see how poular they are just bought 1 my self and oh its soooooooooo nice and it aint even been setup yet.
i got a JL W3D2 12" with box for 200 notes which is a good deal as most places have the subs for 200 on there own without boxes.
what ever you do dont get 6x9s if u have a sub or if u do have 6x9s and a sub 1 day unplug the 6x9s to hear such a huge difference.
i have the alpine cda 7893r head unit good choise m8 only bits i really want to get/change is i want some focal components for the front and some components for the rear also posibly any way they will be amped oh and a farad cap for the sub for the quick bursts and also gonna get a drycell battery too
oh then the alpine cd multichanger and prob then set up screens etc for dvds and console.
have you budgeted for cables and boxes cos most people forget about that and then realise they dont have enuf cash to buy it all.
also i recon it would be worth doing an install so it looks good so i.e making a false floor and that way makes it harder to nick the stuff.
MaLicE