Welcome to the forum. If you do a search for air brush in the upper right corner one of the results is a thread on what airbrush to buy. If you go to that thread there is a link to a site a guy has that does airbrush critiques. He has covered just about all of them. I would paste the link for you but I haven't got that part figured out yet. If you can't find it just say so and I will copy the site address down for you.
David