I know this is probably not the most unbiased forum to post such a question, but I will anyway to see what sort of response I get.
If you were not heavily invested in one brand (ie a 4yo rebel owner) and looking to upgrade your equipement and buy into a camera brand system of either Canon or Nikon, what would you buy into today. Lets say you had 5-6k to do it with.
I guess this post is directed more towards those who already shoot both Nikon and Canon and have extensive experience with both.
As far as typical useage of the equipment would be, 50% portrait/people, 20% landscape, 20% wildlife, 10% sports.
While I am familiar with the Canon brand, I have not used Nikon so I have nothing to compare my experience to. For those who do, what would you choose today knowing what you do now.
You're asking for a lot out of your camera. People and Landscape is about DR while Wildlife and Sports is about FPS, AF, and high ISO. This will probably be the only time I ever suggest this camera, but the 5D III may be the camera for you. It's kind of good "all around" camera. I can't think of any Nikon cameras like that(in this generation)? If you wait awhile the D600 might be a cheaper option, but that could be a LONG while. As much as I love the D800E - I wouldn't recommend it to the average photographer. It's more of a specialty camera that needs finesse.
As for lenses, Canon and Nikon users each think they have the best lenses. Canon does have the lead in Tilt-Shift, though. That might be something to think about with Landscape.
If I were you I'd put together a Nikon and Canon dream package and work from there...