I use some funky HUSKEE air compressor I bought for $60 at a auction.. looks like a TSC Farm Store brand from the 60's.. but she works like a champ, and runs my air ratchet and drill like a champ!
Don't know what kind of power you'd need for a sand blaster, tho.. but i'd like to have one when it comes time to peel that surface rust off my '46!