I have the $22 (on sale) Harbor Freight, and I run it with a pressure regulator and dryer off of my big compressor.
Playing around with Cerakote, painting a helmet, etc.
Thus far, I am really happy with it. It's very easy to get a decent coat on things. My wife's mother (professional artist) taught me a little bit of airbrushing before she passed, and it is harder to run than her ~$3000 one (and I suck compared to her), but for what I want to do, it's great.
http://www.harborfreight.com/deluxe-...kit-95810.html