Trying to figure out what plasma cutter to get. Had it narrowed down to a hyperterm 30xp. But now looking i see they have a 30air. I think the only difference is the 30air has an onboard air compressor? Does the 30air have a compressor that is lots big enough for it to work ok? Im thinking it should have nice clean air and make it more portable? Im not sure on what the price is between the 2.