I don't think you can go wrong with Ervin or Anibal but I personally wouldn't bank on Cueto.
Ervin should be in line for a correction and some wins.
Anibal's stuff has always been pretty good but I think he lacked consistency. I like the way he's looking so far this season. Over 2:1 K/BB ratio (as he was all of last season) and ~200IP. Way less home runs allowed than Santana.
So let's say Anibal