There's lots of good airbrushes out there, but you're already on a good path since you have a compressor and regulator. A moisture trap is also a good insurance policy.
As for brands/models, you'll get lots of different recommendations. My observation has been that any of the better quality brushes will yield very good results after you've had time to practice and learn how to use them. Time and practice will be the most important ingredient.
I don't think you could go wrong with any of the following common airbrushes:
Single action - Paasche H, Badger 350, Badger 200
Dual action - Paasche VL, Badger 150, Badger 155, Badger Crescendo
Iwata also have some very nice airbrushes.
Good luck
M.