My 2 cents worth...
I highly recommend Badger, great quality product and parts can be gotten everywhere. I would suggest the model 100, it is an internal mix, dual action. It can be used for fine work, pencil thin to about 1 1/2" for broad coverage.
I used to have the Aztec, had it for about 8 years, and finally got rid of it because it felt cheap and would go through a tip or two a year. I also had to send the body in for repair once, and although it has a lifetime warranty, I was still out of service for better than 6 weeks.
For what it is worth, I've been airbrushing for better than 25 years. Started with a Badger 350, another good airbrush.