I think the most "establishment" choice is going to be George Allen. I'm seeing a lot more of him in the news.
He's my "third" choice as of now(behind Governors Sanford and Pawlenty), but I have no problems with him currently, and give him credit for sticking his neck out on those gun votes.
McCain would get run out extremely quickly in the next primary. Most republicans I know can't stand him, and that's not just the gun owners. They just don't trust him.
McCain is a peacock. He loooooooooooooooves that TV camera.