I suggest you take Mike's advice, as something like that might not be bad.
However, seeing as this is your first AB, I can recommend the Mini Blue Ice/Contempo combo. I know that they come in a boxed set for the two together. I got mine more than a year ago, and it's worked fine for me. Also, the compressor should be able to be used with Badger airbrushes. The compressor is not adjustable, so I don't think you need to worry about a regulator. Since your son will be painting overall finishes, and you yourself the same for the most part, I think you will find the Contempo a very good all-around brush, and with some practice, you can create pretty fine lines.
Also, if you do chose to go the Aztec route, try to airbrush wth acrylics only. For your son, testors markets very nice high-gloss acrylic paints, along with Model Master and Tamiya. For yourself, as allready mentioned Model Master and Tamiya have a full range of acrylic colours.
Also, the AB IS easy to clean, regardless of what many on this forum will tell you. When done, all you do is take off the nozzle, run the AB under the tap, separate the nozzle into it's two components, and leave it overnight to soak in some Windex, and that'll keep it like new.