I'm a cheap *** for sure. Yeah, 60 feet should get me close, maybe a bit more depending on where I make the connection in the shop. Actually, there is a concrete apron around 3 sides of the shop, and the back side (farthest from the house) is the only place I can come up from the ground. So, in effect, I have to go around the shop before I can come into it. So, that will add probably 25 feet.
Let's say 100 feet of 10/3 w/ground to be safe (can probably only buy it in 50 or 100ft rolls), plastic conduit/fittings/cement, sub-panel, breakers, etc. As you know, it's not just the wire.
Anyway, thank you for sharing your knowledge. When I'm ready to pull the trigger, I'll put up a photo of my current main panel and perhaps you could help me make the proper feeder attachments.