They need to do something similar to what they did in 2004.
I am not sure they have any big need, I think they have a multiple of smaller problems which can be fixed in smaller moves, however a larger deal/along with smaller deals could solve major problems.
If they acquire Halladay, all of their rotation problems are fixed with a surplus remaining to round out the rotation, especially in a playoff series when you only need 3 starters (Halladay, Beckett, Lester).
They need a SS. Lowrie wont cut it, they need a SS. In a Halladay move, it could maybe net us Scutaro, with Lowrie going to Toronto.
They have found their solution to spell Lowell, Laroche can provide some offense with Youk going to third.
I think at this point, Green needs to go, and they need to find a utility inf who can play all of the infield positions adequate defensively.
They need an outfielder who can play all three OF positions, and bring them some speed, someone like Juan Pierre who has seen his appearances diminish since Manny has returned.
In summary:
Halladay and Scutaro to Boston, the usual suspects and Lowrie to Toronto.
Green leaving, bringing in an INF who can play 2B, SS, 3B
Juan Pierre for a couple mid-level guys.
C Varitek/Bard
1B Youkilis/Laroche
2B Pedey, util inf
SS Scutaro/until inf
3B Lowell/Youk/util inf
LF Bay/Pierre
CF Ellsbury/Pierre/Baldelli
RF Drew/Baldelli/Pierre
DH Ortiz/Laroche
Bench:
Bard
Baldelli
Pierre
Laroche
Util Inf
Rotation:
Halladay
Beckett
Lester
Wakefield
Penny/Smoltz
I think they could reasonably get this done.