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Really it will be limited by what kinda tools you will be running and how many will be running at the same time. Also, will you be running hard airlines in your shop or do you want something that you can actually move around if need be? If you get a smaller tank, obviously it will cycle more. I would also get something that has at least a 120-150 psi rating and a good attached regulator. If your just running staplers your air use will be pretty smaller, if your running impact wrenches all the time, go a bit bigger. I think we have around a 30 gallon in the shop with a 2hp motor, i know its a craftsman. We run 2-3 things off it at once, usually in pretty constant use. It cycles about every 15 min or so. However it is small enough that we can drag it around anywhere (also nice since our scene shop isnt a permanent shop).