Check out this place Richard
http://www.everythingairbrush.com/index.html
You should be able to get a good deal on something there
look for something around or over 40psi & dont buy a aztec airbrush, i have 1 & it's bloody awful, 1 of their AS range brush's should cover it
Not used those cans before so can't really comment on them, check ebay also for some good deals