Which one, if either should i stash on a dl spot?

in my league we have 3 spots on our rosters for players on the dl. regrettably two of the spots are occupied by jake peavy and adam wainwright. i am thinking about picking up one of these three and simply stashing them for down the road. i am considering jason schmidt, anibal sanchez, and now possibly josh johnson( after seeing some encouraging reports). which one of these could possibly have the most impact later this year, if any?