Get the gravity fed HVLP sprayer from Harbor Freight, its anodized purple in color. Its sprays water and oil and works fantastic. Like mentioned above you need a decent compressor to run it. You have to keep it clean after every use and you cut the paint if your using water based you cut it with water pretty runny and oil based with thinner again pretty runny, if you don't it will spray like crap and clog the gun. I always do a test piece of wood before I spray the actual cab to set the spray correctly, this gun is completly adjustable and has its own PSI control valve on it also. I spray around 90PSI constant if remember correctly, I don't paint in the winter, to cold to damp. The gun is around 50.00 and I was at Harbor freight the other day and they still had them in stock. That electric gun is crap and the 100.00 sears gun works no better. I heard Costco had a decent HVLP gun for a good price. Make sure its gravity fed also.
Joe(acejedi)