I am going to run power to my unattached shop (15'x24')from my existing 200A main which is about an 80' run. I am planning on the following: (1)50A 220v outlet to run an smal AC stick welder, (1) 20A circuit for lighting inside and out. I am planning on having an upright refrig/freezer, and will use an 8000 or 10,000 BTU window unit AC on occassion, as well as a few extra outlets on the inside and one on the outside. I was figuring at least two if not three 20A circuits for outlets. I will also run on occassion a 6.5hp air compressor and various power tools. Do these circuits seem reasonable?

My main question is the size of my feed. I was planning on a 100A or 125A subpanel. Should I run #2 THHN copper from the main or can I get away with #4? I am going to drive a ground rod at the building, and was thinking 1 1/4" conduit.

Which subpanel would be best?
What feeder wire size?

Thanks,

Ground