Lol the Red Sox wouldn't trade Lester. The guy has overcome cancer to become one of the ten best pitchers in the league at 25 years old. He's a power lefty who is entirely capable of averaging over a K an inning.
I'm pretty sure the Yankees would be laughed out of wherever they are if the best they had to offer was Joba, Melky, and Aceves.
I wouldn't trade that package for Halladay. Look what the Indians got for Lee and what the Twins got for Santana. Teams are not going to trade big time prospects for a guy in his mid 30's that they will also have to give a huge extension to.