The starting pitching is fine. Lester and Buch are #1 and #5 in ERA in the AL, so they're going to be one of the best 1-2 punches out there as they approach their prime years. Between Lackey, Dice-k, Beckett, one will have a great year, one will be average and one will suck-- that's what we need to expect from now on. But even with one underperforming, its still a great rotation, and on any given week, three pitchers will be lights out.
The positions this team needs to replace with big bats are C, 1B, COF, and DH. VMart will cost a bit to resign, but besides that the others are fairly cheap fixes, especially with the 50-60 million that this team is shedding. This team needs one more elite setup guy, but I think that will put them over the top. Some of this solutions may come from within. The core of this team is too good for it to fail with the money available for them to spend.