I'd go with Beckett the rest of this season. Santana's poor play over the last month reeks of the situation where when the Mets fall completely out of it he goes the DL, just like the rest of the team.
Beckett will also give you Ws when Santana won't.
In a keeper league it might go the other way but to win NOW its beckett all the way.
Johan clearly has the second half numbers behind him to prove that he is the right choice. Was dominant again today. People just hear the name Beckett and salivate, but Johan has been doing it better longer, I love them both, but for a second half run i'll stick with Santana.
I don't know how anyone can say they'd rather have Beckett. Johan has given up 2 runs in his last 3 starts, and Beckett pitches in the AL East... Add that to the fact that Santana has always been the better pitcher and this is simple.