ozzman:
I would not recommend double action, because those are slightly harder to clean, but a single action is perfect for a newbie.
I changed from a Paasche H (single action, external mix) to an Iwata Eclipse HP-CS (double action, internal mix) 2 years ago. I found the opposite to be true. The Iwata is easier to clean and keep going when changing color. At the end of the day, I take the needle out to clean more thoroughly. No soaking in cleaner needed as was the external mix airbrush.