I'm assuming that's David and not Daniel Murphy, and though I think Moose is going to improve this year I think the Murphy/Harrison duo is a more interesting combo. Steady enough pitcher and a guy who could hit as many homers as Moose given time (as well as a bit of speed added in) make the Murphy/Harrison group more attractive.
Oh, Daniel Murphy? Then I'd stick with Moose/Pestano and see where Moose takes you. I think Pestano is a good guy to have around given his ratios and the possibility, however likely or not, that he wins a closer job due to a Perez trade or long term injury. Harrison doesn't wow me enough to make the trade work since it's Daniel Murphy.