Video Video Video, if another person tells me that still shooters need to shoot video I will scream.
I was going to buy a 5D Mark III and let my Mark II be a backup, but with the announcement on Gizmodo of the new BlackMagic Cinema Camera I am not so sure. And then there is the Nikon D800 to consider as well. Canon may have been first with a camera that still shooters have been using to shoot video but the BlackMagic camera shoots RAW...
BlackMagic Cinema Camera: Whopping 2.5K Resolution for Under $3000
Gizmodo article HERE.
Nikon D800 $3000
And the Gorilla in the room, the Canon 5D Mark III $3500