Tough choice between Halladay and Greinke. I'd keep Halladay if you want to bolster your pitching staff. I think if you want to bolster your offense, save the 6th round pick for a bat and keep Greinke. I think Greinke is going to be a very good pitcher this year.
Thanks for the help on mine, I will post my lineup in my signature with this post if you want to add some more advice.
FYI: I'm in a 12-team keeper, roto (standard stat + holds/OBP) league. Also, I'm planning on cutting Mora soon, so I'll have two empty utility spots.
MI- H. Rameriz
OF-Cargo Jennings Heyward
U-Morneau Markakis Brown
SP-Price Greinke Zimmerman Moore Anderson
RP-Nathan McGee Doolittle Grilli