Wiggins won't get a better chance to win and I would love to see it happen but something tells me that he won't quite manage it. His best performances to date were 4th in the the 2009 tour and 3rd in last years Vuelta. Pretty good and will do well in the time trials, but still not the best climber and can't see him accelerating away from everyone to a mountain top finish somehow. More likely will probably just try to gain time in the time trials and shadow the top riders in the mountains (a bit like Indurain, I suppose).
Andy Schlek is better in the mountains, could grab some time there, but will lose out in the time trials.
Evans is a pretty good time trialer and was equal to everyone in the mountains last year. So has to be favourite to win again this year.
Verdict:- 1st place goes to Evans. Places will be a toss up between Wiggins, AS, FS, Nibali, Basso.....
Also looking forward to see some fireworks from the likes of Froome, Hushovd, Rolland, Boasson Hagen and of course Voekler