Forget tune-ups, his first fight should be the winner of the next HW fight. He's already proven himself. Not in UFC, but who cares. There's no one in UFC's HW division that he needs to fight to prove that he's a contender.
I think that Sanchez fight is just an image fight. It's just a fight that White set up to hype him up. That's a shame. If he absolutely has to fight a tune-up, it should be a #1 contender fight against Arlovski. The winner getting the HW.
Honda > All Others