At this point getting a 5DM3 makes more sense being that its only $800 or so more unless the little wifi and gps thing floats your boat.
If you're satisfied with just a very good center point, 6D makes more sense since @$800, you can get very good L lenses already. E.g., just add a little bit more and you have an MPE-65 or 24-105 or a 17-40. For first time budget FF users, a lens might be more important than having the amazing sports AF of 5D mark III. On top of that you also get wifi and gps. For travel photography, these features are very handy. Oh and add to that the significantly lighter body. For all-day hike for example, it will be heaven for some.