Just need the battery grip.
I am impressed with the 5D MK III. The only thing that is missing is the battery grip which I understand will be shipping at the end of May, (from Canon Rumors so take it for what its worth). I feel the grip will give the camera a better feel and with the longer lenses, better balance. I got one for the MK II and for me it really feels more comfortable to use especially going back and forth between the 1D and 5D.