I recently got a surface pro 2 that had a broken screen, the touchscreen revision shows v1.5, as far as I am aware only...

I dont suggest replacing the screen yourself, paying Microsoft would be cheaper; replacing with microsoft is about 300 USD

I've bought about 5 v0.5 digitizers, only 1 worked normally but with "ghost touches". I had about 4 surface pro 3s to repair and all used v1.1 digitizers. I've had no success with replacing the digitizers, although the cost that I paid for each LCD Digitizer combo had turned up to be close to the replacement cost microsoft charges! For most people you might be better off with paying microsoft because a dented case can make it troublesome to replace the LCD as well I suspect anything before v1 is basically preproduction, the people selling v0.5s had dug them out of a bin somewhere and started selling it for a buck.