personally i HATE FBI. their customer service has sucked every time i have contacted them!! i bought a roll pan from them, and it was the flimsyest piece of sh*t i have ever had the misfortune to work with!
Suicidedoors, and avs have very good customer support, and will do you right on everything, i love avs's rocker switchboxes, although they are a bit pricey, its well worth it IMO.
the fullsize i bagged, i went with almost all my parts from suicidedoors, and ran re8's all around, 8 gallon tank, dual viair 480's, (4) 1/2" valves for fills, and (4) 3/8" valves for dumps, and 1/2" lines... it was very controlled lifting and dropping.
i bagged the front of my s10 (my first baggin project) with almost the same setup as the fullsize..
as for the kit that you listed there, i dont trust their metal work, a single viair 380 will be slow as **** on a 7 gallon tank, acrylic switchboxes are out of the 90's, and there is better technology now (avs switchbox *cough*), i have no personal oppinion on air lift bags, although i have heard of the bag separating severly, i run slam specialties bags when i can....
fittings will be the most expensive part of your experience.