Shogun out vs Liddell with knee injury

Well, it looks like Shogun has hurt his knee again and had to pull out of UFC 85's main event with Chuck Liddell. The big question is who will replace Shogun? Who is main event worthy? What about Rashad Evans? I think that would be a good fight. Other than Rashad, I can't really think of someone else who could step up and take on a main event.