Hey Loylein...
My girlfriend bought me one of the top of the line Aztec air brushes and after a year or so, it doesn't work. it's impossible to clean because you can't take it apart. So any time paint dries inside (whehter you know it's there or not) you're screwed.
I would look at MicroMark for a compressor. they have a good generic compressor for like $119 www.micromark.com
Also, I'd stay away from Aztec airbrushes. Haven't heard many good things about their longevity. I'd look at Paache and Iwata. I'm in the process of looking for a new one and they're pretty solid. Internal Mix, Double Action, Gravity feed I have found is the easiest and best way to go.
Good luck.