Let me say first I agree with Greg, ask the customer. Next put the run from the house to the shop in pipe. Pipe is cheap, digging is not, the difference in cost between 1 inch pvc and 2 inch pvc is not too drastic. I would run a 2 inch pipe for my power, and use the 10awg multi-wire circuit. Do a good job figuring your conduit route, keep the bends to a minimum then when you need to get 100, or 200 amps out there it can be pulled in without too much difficulty, and no digging. Let the customer know why the pipe is so big, they will appreciate it.
