Since sloar likes 'em, I may have to buy one. I use an old siphon-feed Craftsman detail g un (~$50 at the time), but always wanted to try a HVLP detail g un.

You will need a compressor that will handle painting. You'll be using more air than a nail g un, for example. Check the CFM delivery at the pressure you need (adjust for hose length/psi losses) before deciding on one.