My money will be with either George Allen or Sam Brownback--two quality guys. Either will stomp McCain in the primary.
Last night C-span aired a commencement speech Brownback gave at a Catholic university--very impressive.
www.christendom.edu/news/gradspeeches05.shtml#sam
Allen is my favorite candidate at the moment as well. I think Romney's extensive business experience would make him a fine VP pick though.