2 cents worth...
Go with a 128 or 130 main jet and 3 to 5 .01" shims under the main needle. Best bang for the buck.
I ride in western NC from 1,500 to 5,000 feet altitude. [s]I have tried both the 128 and the 130 and cannot notice any measurable difference. (using a 128 currently).[/s]
Be sure to open the slow speed pilot jet screw 2.5 turns, then tune from there.
EDIT: I changed back to a 130 main jet... yes, I can tell the difference.