Keep Carroll. There are few forwards in the world who can boss Terry and Ivanovic like he did today. And like Cpt_Reina said in the Carroll thread, he's been grossly mis-managed by Kenny this season. Benching him in a cup final when he's come off a monster of a performance against Fulham is baffling, atleast to me.
Give the lad a run of games next season. Try to work out a system in pre-season where we can integrate both Carroll and Suarez in our side and sign players who CAN fit into the system. I'd say, get a poacher in who can work off both Suarez and Carroll's work. Get a winger in who's not Downing. And get a commanding central midfielder who can help move our play twenty yards up the pitch where we can use Carroll as a focal point of our attacks inside the opposition box with plenty of midfield runners to feed off from him. The myth that we don't play our best football with Carroll in the side was well and truly shattered by that first half performance. Winning the Premier league is all about having options and Carroll is one hell of an option to have.