All the pro painters out there will stomp all over me for this suggestion but look at the Harbor Frieght 2 quart pressure pot HVLP. I have painted half a dozen cars with mine and love it. Cost is usually less than $100 (a fraction of the pro Binks, etc.), the free paint head makes painting a car from many weird angles a snap, and the 2 quart cup holds enough paint to do a whole coat w/o stopping. The quality is excellent and the design is a direct rip-off of the high priced units so performance is acceptable too. Obviously, if I were a pro and did high production work, I would spring for the top of the line equipment. For the hobbiest though, can't beat the Harbor Freight unit.
Ok, boys start stomping!!