Right now...I just want a/c in my garage. Hell, I'd take a fan! It was 110 degrees in my garage yesterday.
But I'd go with a 2 post lift, tire machine and balancer and hell...and alignment rack. A nice tool box, sink, and a nice compressor. Don't need the lines, a long hose will do.
I'd like a nice epoxy floor. Then build a front office like room with the fridge, couch, and TV. Then hire a model in a bikini to serve me drinks while I'm covered in grease and sweat.