FI BL's are pretty cheap and good subs one of the guys just got his meter'd and did a 140.4 on a sweep on a TL in a jeep I think he has... not to bad imo running a 1000w alpine amp...
https://ssl.perfora.net/www.ficaraudio.com/sess/utn;jsessionid=1546185f1920327/shopdata/0015_BL/product_overview.shopscript
about $300 for one of the 15"s or 18"
a pair of R 12"s would be pretty good too, I did a box for my buddy running a pair of R 12"s in a 90 pathy and he's doing 142s on the new TL with an RF T1000 amp pushing them he did the 142's playing airforces by young jezzy. box is 6.5ft^3 86in^2 port tuned to 35hz... slot port down the middle of the box one sub on each side all rear firing... most suv's are loudest subs up ports back... so he could get louder with a new box and a little elbow grease...
http://cgi.ebay.com/2-ALPINE-SWR-1222D-12-TYPE-R-DUAL-2-OHM-SUBWOOFER-NEW_W0QQitemZ150110197931QQihZ005QQcategoryZ18803QQrdZ1QQcmdZViewItem
just giving some examples of whats out there, Audioque subs are good also and you can get them pretty cheap. you could get a pair of SD 2.5s for about $300 or a single HD3
http://www.audioque.com/aq/order.htm
for amps there's alot of good ones around, kicker 2500.1, exile 2400.1, sundown 1500.1 are a few I'd like to play with, orion 2500.1, Incriminator 20.1... big list to choose from, get an 0awg amp kit off
ebay too they can be got cheap, or knukonceptz.com get a few feet on here in the classifieds for your big 3 and pick up a decent batt or two and you're set. down the line you can get mids and a mids amp. pg xenon amps are sick too imo //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif and have been comming up cheap lately.
I like JVC arsenal decks I run a dvd in my truck, and my buddy had an arsenal mp3 player and now has a dvd also and I've had mine for about 2 years and it's still going good. I like alpine too, but they cost alot more
I'm sure since you got one reply more will come in time //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif good luck!