I would NOT DINK AROUND with a rebuild by someone who I don't know. If you don't know of their skills in really rebuilding a motor, checking clearances etc, then you would be wasting money. I know LOTS of motors get built everyday without lots of clearance checking and making sure everything is in spec., they usually do ok. BUT for the money your spending, have a pro do it (like GPW) who does it all the time. They know what to look for and good inexpensive tweaks. For big money, you want it built like a Nascar motor with everything verified so ou don't get it together and blow your new motor. I have seen young guys waste thousands and thousands of dollars on ATV racing builds, snowmobile racing and car builds, and the builder didn't even know what to check......
I would just ship the entire bike (not just the motor) to GPW so he can go overthe entire bike because of its mileage. Check transmission, wheel bearings, etc.
Good Luck on your rebuild!