Lea5: If someone uses a 50D or 60D and is looking for an entry Full Frame solution, the 6D is a no brainer. There are many who can't or wan't spend the money for a 5DIII and will be happy with this camera. I would get one.
Where are you finding the Mark III for $2750? I've been looking and the only places I'm seeing that price are not very reputable. If I can find a legit deal at that price, then I definitely would rather go to the Mark III. I'm coming from a 50d and want full frame. Can't do $3,500 for the III, but am debating the Mark II @ $1899 from BH and this 6D