First off, do you have 220v to your garage? If you do, then look for a compressor that has a 60 gallon tank and the ability to put out at least 13 cfm at 90 psi. It will cost at least $500, and probably more. Reason so high of a cfm is because those air tools, like sanders, use up a BUNCH of air. If your compressor has too small a tank and low cfm, it will have to run continually to keep up, that's not good, shortens the life of the compressor, plus will cause the air to get hot. When the air cools, it will condense and you will have problems with water. I know from personal experience. I don't have 220v in my garage and had to settle for a smaller compressor that has to run constantly for me too use my DA sander. Hope this helps.