I like the team quite a bit, but I don't think you NEED to shop for a top starter. Either Lackey or Myers could emerge as a top starter this year (especially Lackey), and paying top dollar for pitchers is scary. I would try to make a move for another second tier pitcher, which would give you a solid three starters (4 if escobar is healthy) in all categories. Guys to consider would be Haren, Cain, Chris Young, Bonderman, Ervin Santana.
I like the offense, but the infield is weak. I would try to package swisher and figgins or swisher and kinsler to get the pitcher. Swisher and figgins should get you a decent return, and you already have reyes to hold down SBs until someone emerges on the waiver wire. Cuddyer can then move to 1B, and hopefully you can grab a high risk/high reward type 3B somewhere else.