Which Starter?

[harmon]

Help appreciated...need to pick one of these 3 starters for NL only league. 4 x 4 keeper.

Beckett, Collmenter or Koehler.

I see Beckett as high risk/reward with Collmenter being relatively safe and Koehler as medium risk but possibly higher upside than Collmenter.

Beckett and Koehler have nice home parks, Beckett has best team, Collmenter has just been given opportunity to impress in rotation.