Sata makes the best guns period. All the custom paint shops I've seen use them.Mine is a top loader & cost $400plus..
For a inexpensive hvlp top loader Harbor freight has one for $60. I don't know the part no. but it's purple.
Siphon guns are the only way to go altho, I still use my 26 yr. old Binks model 7 for epoxy primer.