I want to pick up a compressor for the garage. I was going to get one of the Sears Models but don't know what size to get. It would would mostly be used to inflate the bike, car and trailer tires but I would like to use some air tools to rotate the tires when needed, etc.... Do I need one of those big 20 something gallon jobs or will one of the smaller ones work? Any suggestions??? Thanks.

If you're going to use air tools , bigger is better. Buy the largest that you can afford.