i have alot of buddies with systems. as for quality id say memphis, rockford and jl come to mind. most bump for the buck? kicker. but they make alot of products. dont get the shallow mount kickers, they suck. if you just want deep loud bass and dont care about clarity or long life audiobahns are okay.
start the system off right with some name brand 4ga wire and some name brand rca cables and a fuse holder and even a capacitor if you think its necessary. for these things i would recomend nothing but rockford fosgate. ive had mtx cables and they left alot to be desired, the rockford rca's are defenitely years ahead of mtx.
get a good amp. rockfords are great, and you get what you pay for, but they are out of my price range and probably out of yours. rumor has it kicker makes a few decent amps, and a memphis amp (like i had) wont let you down. there are a few other good brands i dont have experience with (hifonics, boston acoustics, and others)
get a box that is way heavier than it looks. weight usually equals quality and sound clarity.
now get some subs and test them out. and dont be an idiot and choose your subs by how they sound behind your car with the hatch open, test it how you are going to use it.
important!!! put some rubber tool box linning pad in between your license plate and the hatch. this eliminates license plate rattle. and make sure your using all four screws of course.
good luck. whatever you do take pictures :shiny: