I'd like to suggest Jason over at www.suicidedoors.com, his site and business is primarily for the minitrucker crowd, but he does have some very well built products that can be used on any application. His prices on valves, line and the other stuff is very reasonable.
jason is ok he kinda over does his brakets and 4 links, air ride tech is the way to go. air lift has some nice products.. i can get some nice deals for you if you want.. Billy
Both Kustombuilder and Jason are stand up guys I have delt with both of them and they both went way out of there way to take care of me. Billy is right Jason's stuff is beefy, but it is well built. Jason is kinda a slow when having him fabricate stuff only because he is buisier than a one armed paper hanger. If your ordering stocked parts like valves and line he ships fast.
I bought from: http://www.kmwperformance.com pretty good price I guess. there was a problem with some fittings being wrong size in my order and they sent me out some new ones right away
Thanks for the info guys. I have airbags and I built the kits to install them myself. Just need to get the lines and valves etc. I will check them all out. Thanks