To start the year:
2B Drury, SS Gurriel, 3B Diaz
When Vlad comes up:
2B Drury, SS Gurriel, 3B Vlad, UT Diaz
Once Biggio and Bo are ready, then there will be some maneuvering/trades that will need to happen. Gurriel can probably move around (OF too), and Diaz can stay as the utility IF, but Drury might need to be traded, assuming he's any good.
I'm also assuming Tulo is either hurt or traded before the start of the year, as I don't see him playing another inning in Toronto, but I guess we'll see.