I Would Go with Option #1. or Option #2 below, if Future builds is a issue, then run a spare 1 1/2 conduit or a 2 conduit from the house panel outside and cap it off 4 future use. #1. use a 30 or 40 amp breaker from the main panel and run a 3 wire #10 or 3 #8 feeders and one #10 or #12 ground to a small sub-panel (4 - 6 breakers). #2. wow a 16 X 10 shed, Save Your Self Some Money you could get b