Should I take Matt Holliday or Curtis Graderson for Sergio Santos?

I need steals but my offense is pretty set. Could use more saves and I definitely need K's so I'm not sure this is a good trade. My team: McCann, Adrian Gonzalez, Polanco, Tulowiski, Longoria, Kemp, Werth, Bautista. Bench: Rasmus. SP: Halladay, Johnson, Weaver, Marcum, Cahill, Anderson, Norris. RP: Santos, Walden, Feliz, Madson.