I guess the question vis-a-vis Lee is this: What's the absolute most you would be willing to give up to get him? Understand that there's a very high likelihood that he'll be just what he's been the past six seasons - a complete ace stud. And you'll have him for 2 more years after this to anchor your rotation, so the Sox' rotation next year could look like: Lee, Lester, Buchholz, Lackey, Doubront. That's an INCREDIBLE rotation.
Here are the Sox' minor league chips (this is taken from a poster on SoSH: http://sonsofsamhorn.net/topic/78133-needs-and-assets-going-into-july-we-are-on-pace-for-97-wins-oh-my/?p=4852571):
Bogearts, Bradley, Owens = Untouchable/Non starters
Webster, DLR, Cecchini = Premium talent available in the right deal/centerpiece for a big deal (need money coming back with Lee to consider)
Barnes, Ranaudo, Swihart, Workman, Britton, Marrero, Vazquez, Buttrey, Middlebrooks, Iglesias = Building blocks for a trade/valuable but not hard to part with.
Ball, Denney, Stankiewicz, Brentz, Coyle, Wilson, Longhi, Williams, Littrell = Can't be traded because of DL or recently drafted/PTBNL with value
Betts, Margot, Almanzar, De La Cruz, Ramos, Lin = Lottery tickets/pot sweeteners
The rest are just organizational filler fungible prospects/PTBNL with little value
We know the Phillies would want as much as they could get, that goes without saying (and yet there, I said it). Here's what I wouldn't include: Bogaerts, Bradley Jr., or Owens. I would be willing to part with one guy in the second tier and two in the third tier. That's a LOT of significant talent going to Philly. But it wouldn't break the Sox' minor league bank. Still tons of quality talent in the Sox' system that is already or nearly MLB ready.
I'd offer something like: Webster, Ranaudo, Iglesias, and a fourth piece like Margot.