LOL, When I first saw 'Paint Guns' I though of the ones that are used for fun, that shoot round paint pellets. I dont know anything about like painting paint guns, but just thought I'd share my brain with yall.
I would agree on the HVLP gun. Another advantage is you will pay for the gun with the amount of paint you save, I was amazed at how much less paint it took the first time I used one. Also spend the money on a brand name gun so you can get parts for it if you need them.
I'd go with a Sharpe, Binks or Devilbiss HVLP gun. They are good quality for the price, much better than an import copy guns. The Sharpe guns are usually priced well and easy to get parts for, I've had good luck with the 998 model. Make sure you get the right fluid tip and cap for your application.