Take a look at the Iwata Neo

I'm just starting to get familiar with the Badger air brushes, but they make a some great brushes - so I'm not sure which is their entry level product. I know a number of the members here use Badgers (I own one also), maybe some one else can comment.

Another good starter air brush is the Paasche H. That was my first airbrush. It's single action (easier to learn initially I think), easy to clean and maintain.

For me the major cost was not the airbrush, the cost canned air can add up quick, and I spent more on my compressor than any one of my air brushes.

Jason