Planning a shop build, any suggestions?

Putting in floor heating and spray foam insulation is a great idea, I wish I had done that with mine. One thing I would absolutely suggest is more electrical outlets. You can't have too many. My garage is 24 x 30, with 10' walls, not nearly as big as I would have liked, but it was what I could afford. I have single outlets every 4 feet at 48" height, and at 72" height offset from the lower ones. I also have a storage area in the rafters that runs the 30 ft length, by 8 ft width and about 32 inches high. LED lighting is a very good idea, a little more expensive upfront, but cheaper to operate and far brighter than fluorescent. I have upgraded mine last year and it is far better. I had the compressor in an outbuilding in a previous garage as mentioned earlier, and it worked very well, keeping the noise down and saving valuable floor space. I also have only one small workbench area, one modest size shelf, and a couple of small purpose built shelves to keep the clutter to a minimum.
Good luck with your project and keep us posted.