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I would suggest that you make a list of the air tools you anticipate using and verify their CFM requirements. Each tool will have a minimum requirement. Use JayG's chart and verify the compressor can supply the necessary CFM. In my experience, air sanders and grinders use tons of CFM. The bigger the motor HP and holding tank the better, with the exception that a bigger tank takes longer to come up to pressure. Are you going to use it daily, weekly, etc.?
Make sure the holding tanks are larger (volume wise) than the tires you want to inflate from flat. Otherwise they take bloody forever to fill with a pancake style unit.
I would also recommend that you use an oiled pump instead of an oil less. Small oil less units are great for bike tires, nail guns, short duty cycles.
Hard to imagine a house built in the last 40 years that doesn't have 220V.
You'll be amazed at how many neighbors you meet, when the word gets out you have a compressor.
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