How much power for a new shop?

[TexasTimbers]

200 Amp is the minimum you should consider. Also, I don't think it has been mentioned, after you have wired your panel and are done, always run an empty conduit from the top of the panel up through the top plate and cap it off. Leave it completely empty. It should be at least 2".

It's for the additional circuits that you are certain you'll never need to add, that one day you will  certainly need to add. ;D.

The existing empty chaseway will make you feel like a genius later.

[Trent]

My shop has a 200 amp panel I got a good deal on (really don't need 200 amp). I feed it with 10 gauge wire. It is fed from a 30 amp breaker in the main panel inside the house. The 200 amp breaker in the shop is simply a switch, the protection, is the 30 amp inside. I can upgrade any time in the future to 60 or 100, by pulling bigger wire, and installing a bigger breaker in the house. It's been 10 years, and I still run the air compressor, and welder one at a time.