Yea, you very much need another solid SP. I'd feel happy with Oswalt, Lowry, and Blanton.. but Liriano might start in Triple A, so takes his value away completely.
Try trading Duke and Turnbow for another starter, and possibly a cheap good OF bat (Geoff Jenkins, Jay Gibbons, Brad Wilkerson, Kevin Mench type.) Eh, might as well keep Kendall, though it's your call.
...Boston papers now and then suffer a sharp flurry of arithmetic on this score; indeed, for Williams to have distributed all his hits so they did nobody else any good would constitute a feat of placement unparalleled in the annals of selfishness. -Updike