I'm unsure how much they're bumping up his pitch limit, but I would say the first 5 is a better bet for anyone sick enough to lay this price on Joba at this point.
If he struggles at all, he will not last long esp. being a KO type of pitcher who gets into lots of long at bats to begin with, and you simply cannot trust the Yankee bullpen unless the Yankee bats smoke Greinke.
Honestly, it isn't worth taking Joba. For value's sake, I think Greinke would be a good play, but I think both ends are a little unpredictable. Joba could be lights out, or he could perform as he did in his last start.