The more I think about it, Nick Diaz and wrestling has got to be one of the best. I don't like the guy... but he would essentially be a better version of GSP.
Great striking, great chin, great ground game, incredible heart, and the ability to dictate where he wants the fight to go. Don't forget the killer instinct he already has. He wouldn't get "layed" on for anymore losses because he would have the wrestling to stop the TD.