The weldingweb forum is really a great source for anything for a great shop. I have done a lot of welding since I learned about that site. Many new tables, fixtures and inventions that I never knew possible.
Devilbiss guns are really nice and they do a better job than the HF guns. I hate to say that because I was stuck on HF guns for a long time. I have the Finishline 4 kit with 4 different size nozzles and a Tekna Copper for base/clear. I still have my HF gun but no reason to use it now. As with everything else, you do with what you can afford and I have seen many decent paint jobs with HF guns. I just wonder how much better they would have looked if the guy had a Devilbiss or something better.