I don't care if your only filling up tires, do NOT buy an oilless unit.
I received a very nice no-
oil Craftsman for free. 6 hp, 33 gallon. TOO NOISY. For anything. It's rediculous. I can care less about changing
oil in a compressor. I do it in everything else I own with a motor. It didn't cost me a dime, but I'm considering buying a new one.
Go with 220V if you can. You'll end up with a much better compressor. You don't want to end up in a position where you want to use a cut off wheel and you can't because you didn't buy a good enough compressor.
-steve in nj-