Listen to Walter, he knows his stuff.
Another good brand is Graco. Any of those three are good industry-standard guns (Graco, DeVillbis, Binks). I like Graco and Binds best.
However, I'm not sure you want an airless gun for spraying (non-industrial use). Airless is commonly used for painting houses, etc. and the paint does have to be clean and uniform velocity. Airless would not be used with syphon feed, gravity, or low-pressure pot, (these three along with HVLP may use air or not use air to get the paint to the tip, but they do all use air to atomize the paint and move it out of the gun). Airless runs pressures much higher and actually forces the paint out and atomizes it.
Several years ago I had the opportunity to use a Graco self-contained electrostatic gun and it was WILD to watch the paint fog wrap around the work and get sucked to it.