With Wagner claiming not to have any issues with the finger all the while struggling a bit and having BP writers speculating about the health of his finger I would roster Sanchez if you have the space. He's been outstanding this year and will most likely close if anything does happen to Wagner.
I'm actually carrying both him and Heilman in a league that I carry 6 MR's for ratios...you could do a lot worse than these guys in the ratio department.
Hope springs eternal
grows like ivy on the vine
then dies in the fall
--Haiku for a Cubs Fan, The Loveable Losers