if you have to use a hobby quiet type compressor due to noise issues.. I would suggest getting the best one you can afford before sinking a lot into your first airbrush ,, airbrushes of every type come in all price ranges and are plentiful... however the compressor is the heart of the system and is worth getting one that will still be useful as your needs evolve.
on the other hand,if noise is not an issue, than look into the cheaper shop type compressors and maybe put more into the airbrush.