Hi Peter,
Mine is a 3hp but i think it's only about 10CFM. I would aim for a 16CFM at least, since you don't have 3 phase you can't really go bigger easily. I'm tossing up whether to buy one of the cheap ebay Unimacs, or just go a second single phase unit and run them in tandem. As much as i like the Stanley Chris linked i think it may just be too small.
Ew