New X-Men by Grant Morrison Vol. 2: Imperial

Enter the U-Men! When envious humans begin dissecting mutants and grafting their body parts, it's up to the X-Men to stop them! But things at home aren't much better as Cyclops and Jean Grey can't stop fighting, Jean's powers flare out of control, and Professor X's mind is trapped in the body of his comatose evil twin! Introducing the new Angel, and the X-Men have never seen anything like her!