how much are you looking to spend?
tanks doesn't really matter brand, but i've heard AIM ones leak at the welds
bags, either slams or firestones. i went with slams, because when inflated they don't expand width wise.
compressors, although air zeniths look pretty sexy, they are so new and have quite a few problems from what i've heard. viairs have been around longer and so they've had time to work out their bugs. they're also having a pretty good sale right now if you buy 2 compressors. or you can even get an engine driven if you want to dish out that money, only down side is you need to have it running if you don't have a backup electric one, but it will fill up your tank in no time.
valves, i've heard pretty much all valves are fine, with the ocassional sticking that can be fixed with air tool oil. 8 if you want FBSS, 6 if not
fittings, you will need to determine how you plan to do your setup to know what and how many fittings you need.
50ft of dot airline should be fine, if you go with analog gauges you're gonna need some 1/4 line too
teflon tape or another type of sealant
a notch, and misc. nuts and bolts.
i might be forgetting something, maybe someone else will chime in
you're also going to need a switchbox, gauges, a link setup (unless you don't want to lay out and just want it for the ride quality), mounts for the front and back. the tank and compressor is personal choice, how much air you're gonna want to play with, how long you want to wait for it to fill back up...
and on to towing...i read that it's not a good idea to tow while running a cantilever setup, but bags over axle should be fine...good idea to read up as much as you can. fullsizechevy.com has a lot of info on their street forum.
www.bagginit.com/ www.suicidedoors.com just a few others i can think of

Edited by: shaved80 at: 10/26/06 10:02 am