Jim,
I use an Anest Iwata LPH400. It is a professional quality gun. I bought the gun on Ebay for about $230 about 3 years ago. Normally they run about $500 or maybe a little more. Mine came with a 1.6 mm tip. That is to big except for real good painters. I bought a 1.3 mm tip and it works much better for me. I think a 1.4 mm tip would be OK also. The reason I bought a 1.3 mm tip is that I am a non-professional painter with some experience, but not an expert. The 1.3 mm tip is small enough you don't get runs and sags as easily. It takes a little more effort as it takes a more time to spray stuff. It does a nice job. I painted my 28 special coupe with Concept this past August.
Rusty Nelson
Lakeville, MN