Welcome Dave!
Don't go cheap on the airbrush compressor. However, don't go crazy either....
Look into getting a commercial type of compressor at Sears or the local hardware store rather than one designed specifically for the airbrush.
A big one will be useful in the garage for pumping up tires and blowing off the work bench as well as airbrushing.
A compressor made for just the airbrush is only good for..... well, the airbrush!
The big one will have a tank, which you can fill up and run all day with out having to re-fill.
Just a thought....
One other thing, put your name, first and last, in the signature text box found in your "My Controls" section.... Thanks!