Cisse without a doubt. As a penalty taker i don't think we have anyone else with the confidence and the ability that he has, not even Xabi when it comes to penalties. Mori is another option as well but Cisse if he is on the field.
I also expect to see Cisse as pretty much first choice 11 next season either as out and out striker or playing on the right. (hopefully more as Striker)
He has the class, quality in finishing, pace and after the way he worked to come back from that horrific break we now know he has the bottle and heart to do well. Rafa definately seems to rate him highly enough to try and buy him at Valencia and play him when he was just coming back from a very nasty injury.
Let's face it. He has certainly shown he has the right 'Mentality'.
Only thing i worry about, is if his 'Lordship' starts putting on weight with all that home cooked food he will be getting now.