Compressor and air tool question

Get the largest compressor you and youre situation can afford!!! A DA Sander requires a LOT of air. I had a Sears 220V 90 gallon tank, forget what cfm if was.. but, point being I wore it out! I have since switched to a gas powered 9HP 30 gallon tank putting out 18 scfm. I got it used for $900. I'm much happier now, wish I would have bought it the 1st time.