As I've said before, MU buying Fabregas is an absolute no-brainer, especially if they can get him for under £30m. It's hard to see him being anything other than a huge success:
-Proven in the EPL, IMO he was the best player in the league in his position before he left
-A creative, vibrant central midfielder to play alongside Carrick is EXACTLY what MU need, the only other player who could potentially fill that role is Kagawa but it remains to be seen where Moyes sees him fitting in
-Has a very, very good understanding with RvP, his runs will be much more effective with Cesc feeding him
-Good age, could easily get 5 years out of him at the top level
-Speaks good English
Moyes should make him the #1 priority, the only other players who could have the same impact on MU as Cesc would be Messi, Ronaldo and Bale but they would all cost at least twice as much if they were able to get them at all.