If you decide to go JL go with a JL W3 for sound quality, a W6 for even better sound quality, and a W7 for pound; if you go kicker go with a solo baric made sub, preferably an L5 or L7. I have a chevy truck with a pioneer head unit, 600W Polk audio 4 channel speaker amp, polk audio 500W sub amp driving a 10in JL W1, 2 memphis Audio 15 MCS69 back speakers, 2 Polk Audio DB 6.5 in components w/ 1.5 in tweeters, and 2 4X6 polk audio plate speakers in the back door. To me it is perfection, the highs are crisp and clear up to eardrum exploding volumes, the mids are deep and crisp, and the little JL does more than enough for tight, SQ bass. In my other car i went cheap on it, 2 6.5 in kicker components, 2 6X9 in infinities i pulled out of the truck, and 4X6 polk coaxials i had laying around the garage. running a 1000W CRUNCH amp pushing 2 kicker comp 12s in the trunk. Sure, the kickers pound hard and rattle the license plate, but 10 times out of 10 i would rather drive the truck if i want to enjoy my music. My advice would be to check out a car audio forum, theres lots of good info on those places. THERE ARE MANY BRANDS THAT GET BETTER REVIEWS THAN JL AND COST A FRACTION OF THE PRICE, its a lot like skis, if your brand-name is popular, the prices go up. If your going for strictly pound, buy good subs with a great amp, at least 1000w to drive 2 12s. If you like to enjoy your music entirely, i recommend a great set of front component speakers (tweeter is separate from the driver), nice back fill speakers, good mid range subs, with 2 amps from the same brand same model line, one 4 channel for the speakers one 2 channel or a bridgeable mono depending on the subs. Like I said check out some car audio forums or find a good local shop thats not a big box store and not hungry to sell you just anything on the wall, it helped me out quite a bit.