We use Sata spray guns at work, but i think they might be a little out of yor price range they range from i think around 200-600 dollarsI'm thinking about getting a New Sata spray gun for use at work, its 429 USD, and has a digital regulator built into the gun,i heard it sprays very nice also! Otherwise, Devillbess makes spray gun for a decent price otherwise there are crappy genarics like chicago pneumatic and others like that. But what does your friend have for equpitment already? It takes alot of skill to paint a car, and make it halfway decent. If he can do it for under 200dollars it would be a mirical, and look like shit, no offense to your friend, if you go to a bodyshop, it will cost you moocho buck for new paint, if you keep the same color, the most likely wont spary the door jambs and stuff like that cuz it isnt needed, but would prolly run you around 400 dollars in paint and alot more for other materials and of course labor whitch is the big killer. If you have anyoth questions please feel fre, i'm sure i can answere them since i do work at a body shop.