Estrada, Cashner, Kel'ly -- Estrada has the highest ceiling and Cashner isn't that good where you'll kick yourself for not gambling on him. You could, however, kick yourself if you don't take Estrada. And you would rightly deserve said kicking.
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Is this a rest of season thing or just a spot start opportunity? Kelly plays for the best team, so if you're interested in wins I'd go with him, otherwise I think I'd try Estrada too. Cashner tends to be a bit hit or miss. He was a miss earlier in the year when I grabbed him for a spot start.