Are you set on Badger? Iwata is what i'd recommend. I have an HP-BS Eclipse that I use most of the time, but it's kinda fine for big tanks. I also have an HP-CR Revolution that has a wider spray. They're not the cheapest airbrushes, but i've had my Eclipse for at least 10 years and it's still going strong. Worth the cost IMO.

edit: I got my Revolution from amazon. It's under $100 there, so not too bad.
http://www.amazon.com/Iwata-Medea-Re...ata+revolution