Buy the guy's battery...get the other stuff elsewhere. 
Not sure who the absolute best cylinders are, but EAI sells cylinders, and I don't think I've heard bad stuff about them. Run 2 Viar 450 compressors, and Parker air valves. The switch box wouldn't be a bad thing to buy, I don't guess, and if the 1/2 inch line isn't cut up for that guy's car, the line would be fine, too. I'm just not big on AIM. Anybody who has around 5 different corporation names to attempt to sell their products without people knowing it's from AIM has issues.
Not sure who the absolute best cylinders are, but EAI sells cylinders, and I don't think I've heard bad stuff about them. Run 2 Viar 450 compressors, and Parker air valves. The switch box wouldn't be a bad thing to buy, I don't guess, and if the 1/2 inch line isn't cut up for that guy's car, the line would be fine, too. I'm just not big on AIM. Anybody who has around 5 different corporation names to attempt to sell their products without people knowing it's from AIM has issues.