I need some air compressor schooling

Hey all, I have a CH ~28 gal ~6HP compressor that I bought at Lowes many years ago. It's the oil-less type, is noisy, runs all the time with air tools and today caught fire at the plug. I'm a little leary of it now...and would like to see about upgrading it anyway.

Anybody have good info, a link, whatever, on air compressors? I'm assuming I could re-use the tank and pick up a new non-oil-less motor/pump/whatever. I just don't know what I'm doing so I'd like to learn before messing with it..