I think we'll know a lot more in 2-3 weeks.....but you almost have to deal Jeffers, unless you somehow can't get a good prospect for him.
Ryan nets you the most, and if they are 2+ games under .500 at the deadline, should be dealt. Otherwise, I can understand them not dealing him (though I probably would).
Bell and Larnach? Tough call, but I think you can deal one or both of them, even if you are in the race. Obviously, if they are well below .500, both should go.
No to Clemens. He's a keeper for the next few years.