There is nothing wrong with using a medical compressor for an air supply. I used one for a long time and the only reason I stopped was when I bought a Silentaire. I still have the medical compressor as a back up but Silentaire is reliable so the medical compressor just sits.
The medical compressor is reliable, quiet light-weight and cheap to buy at Ebaby. Heck, I didn't even have a regulator on it. It didn't need it. The pressure coming out of the little compressor was always 15 psi. Try the little compressor and you'll like it.
http://search.ebay.com/medical-compressor_W0QQsocolumnlayoutZ1