Audiobahn is garbage, for the most part....(i.e Crap you find at Circuit City or Best Buy)

Pick yourself up a copy of Crutchfield and peer thru that for a couple weeks to get an idea of whats out there..

For head units, Id say go with Alpine, Kenwood Excelon, Pioneer (stay the hell away from Sony's garbage)

For speakers, look towards either some infinity's, boston acoustic if u can, polk audio

For subs, JL isnt the cheapest but hands down the best sub made out there (could be argued, but mine is 7 years old and kickin like it was brand new) Some other brands to consider would be alpine, inifnity or polk. (Stay away from Sony again here)

Just remember, 6.5" speakers in the front, 6x9's speakers are in the rear, and you dont need anything more than a single 10" subwoofer to fill the truck. Get an amp to match the sub and with a decent headunit, an amp for the speakers isnt necessary unless ur budgeted for a top quality system...

Thats just my two Abraham's...Good luck dude