a touchup gun is the way to go. for spraying what you want to spray, something with a 1.3 tip. you can get a regulator for at the gun,too. its not wise to use the reg on the compressor to regulate the gun. they can spray polys, stains( great when staining large furniture),lacquers.....
cleanup isnt bad when ya get the hang of it. i get my copper tekna(not a touchup gun) cleaned up in about 5 minutes.
if you want an air brush, iwata eclipse HC/CS. theyre great for beginners and worth the money