I don't think it would be worth it.....he's only going to play 2 1/2 months at the most this year, and even then, are you going to bench Mauer? Maggs is DTD now, but he's been great, and Ortiz is streaky, but he was May Player of the Month.....
I wouldn't drop either of those guys. Don't worry about Santana. At the end of the day, he's still a catcher, and you've got the best. Catchers are probably the hardest position to trade, unless you are talking Mauer, VMart or McCann.
It's not like you have many droppers, but surely, Bourn could go in case this really is V-Mart v2.0, no?
In a keeper, I'd much rather him than not. I'm trying to trade for him and I own McCann already!
Bourn's just OF legs; if you see a difference among him, Borbon, Davis, Morgan, Ellsbury, Fowler, Stubbs, etc in a keeper to the point that you won't roll the dice now, please let me know. This isn't snark (intentionally anywhoo); it's saying you can replace him later if Santana is more like Ernie Whitt 2.0.