Well, I don't know your league and the "special rules" for Greinke, but I was offered (in an H2H points-based league) Juan Gone for Greinke a number of weeks ago-- they think they're getting you becuase it's an all-star player, blah blah. Two things:
one, Juan Gone is overrrated at this point, still a good player, useful but:
two, Greinke looks to be something extremely special. 19yo and in AA-- that's ahead of Jerome Williams' standards, that could put him on Mark Prior standards-- and the talent, the numbers, are amazing. Juan Gone is a sure thing, a sure, old, injury prone thing-- Greinke, sky is still the limit-- and I'm sticking with him.