Its hard to tell you who to target in a trade w/o knowing the other rosters. If it were my team these would be my 7 keepers as of now. Ortiz (only because you like him so much), Beltran, Beckett, Santana, Halladay, Perez (assuming its Oliver), and Delgado or Wilson.
Pick out a young stud you really want and throw everything out there to get him. Abreu, Kent, & one of the 7 above, the rest of your roster.......what ever it takes.