I think the Iwata ones are pretty good value for money, there are lots in that range, so you can find one to suit what you need it for, with many of them being specifically aimed at modellers and they have some decent double action ones that don't require a second mortgage to buy. Build quality is generally pretty good too.
Check them out (and other brands) here:
www.everythingairbrush.com
They've got some very nice compressors on that site too, as long as you have the cash!
Chock