I see on Youtube that a fellow named Brett Green uses the the Aztec line, his work looks good and he seems to favor them. I believe his production is called "Testors Workshop," or something close to that, so maybe he has a close relationship with the brand.
I've owned two Aztecs, they worked pretty much so so, nothing terribly wrong, nor great about them. I had been using Paasche double actions, had thought the Aztec would be a convenient tool. I gave them good care and gentle handling, but they proved to be a bit troublesome and sometimes unreliable. In fairness, maybe someone else would have had better luck with them.
After many years of satisfactory use with Paashe's, suddenly the parts I was getting for periodic servicing became a real gamble, too often the items would arrive damaged or machined incorrectly. Once, an order for two needles and two nozzles arrived with both needles bent and one nozzle flattened at the small end. Another needle order arrived with a severe fish hook at the business end, (no, it didn't happen in shipping.)
On the recommendation of a friend I tried a Badger 155, loved it from the first day. Now I have several Badgers, of them all my favored and most often used are the 200G, single action gravity cup, and 100G, double action small gravity cup. An airbrush not to be overlooked is the old 200 siphon single action, I use mine a good bit for large area coverage. No longer made, but can be found on ebay, some are brand new old stock. The Badger gravity models spray very well for me, they are absolutely the easiest to clean and maintain, of all the airbrushes I've owned.
If you have not looked at it yet, a visit to "Don's Airbrush" website is an excellent time investment, for everything about airbrush types, brands, use and especially maintenance. There are so many great airbrushes and brands out there, check his site and you'll gain considerable insight about them. Another consideration for you, what type service and detail will you really require?
If you're doing small scale and delicate camo jobs, then maybe a $200 airbrush will be what you need. If it's mostly larger scale and no fine detail, hand held color borders, then maybe a $60-$80 dollar Badger on sale will be all you need. I bought most of mine at Chicago Airbrush, TCP Global and Webaire, great service from them all, good discount prices too.
Good luck with the search.
Patrick