Sorry guys - slight error there.
Expertise affects the chance to be dodged & parried, not the chance to hit. They are separate. So unless you have hit the expertise cap, then expertise is always good. Note, for lvl 73 bosses you need 91 points of expertise rating to hit the expertise cap vs 142 hit rating to reach the hit cap.
Having said that, I would take the Gloves of Dextrous Manipulation. With 2x 8Agi gems, you get :-
51 Agi & 42 AP = 2.04% crit & 93AP (G of DM)
29 Agi & 60 AP & 15 Exp = 1.16% crit & 89AP & 0.833% less chance to be parried or dodged (G of D)
Seeing that most of the time we are DPSing from behindm the parry chance is irrelevent, it comes down to 0.88% & 4AP vs 0.833% chance to be dodged. Pretty close, but I feel that Dextrous Manipulation wins out. Incidently, Emmerald's list agrees.