I really think you're overestimating the difference between these teams from last year.
The Yankees got lucky to deal Wright. They dealt Sheff in a fair deal. I am not at all threatened by it as a Sox fan, other than that Detroit now has Sheff--who I always feared as a player.
I guess I consider Pettitte a top line SP, but if he was so top-line then why did the Yankees let him go? He's a very good pitcher. He's not dominant but Pettitte, Mussina, Wang, Johnson and someone else is a pretty good rotation. Nobody who is dominant, no real anchor unless RJ steps up again. I see a lot of veterans who are doing their own thing... as usual in NY. Giambi, Damon, A-Rod, Sheffield, Abreu, RJ, Mussina, etc.? Imported stars.
I would much rather have Schilling, Matsuzaka, Beckett, Papelbon and Wakefield/Lester (who has said he will be at SP... but whom I would use as lefty long relief to keep him healthy). I LOVE the young core of Matsuzaka, Beckett, and Papelbon for the next 3-4 years.
I think next year the teams will be close head-to-head, as usual. A lot depends on if Manny is playing or if the Sox are able to improve their bullpen.
If I'm the Red Sox I think I'm more likely to trade a young starter (Bowden or Bard) than an OF because they have a few young starters for the future, they need something to help them now, and young starters appear to be about the most valuable commodity (i.e., a better return for next year or the year after). They have control of Crisp and WMP for a few years at reasonable prices, they're young so they're useful to build a team around.
I also think WMP is an intimidating bat to have on the bench. Both WMP and Coco deserve a full year on a functioning team to evaluate them. WMP should be batting RH off the bench, platooning with Drew and giving drew a rest to keep him healthy. Coco should have an everyday spot in the bottom of the order where he can try to use his speed. If they stay healthy I predict 95 runs for Coco this season.
Anyway, it should be a hell of a year.