I shoot with a Nikon D800 and it is an amazing camera. BUT more important get good glass. Unless you are shooting murals I would avoid the 800e. It will cause way more problems for a very minor increase in sharpness.
Starting with a simpler (but full frame) Nikon body is not a bad idea and will give you similar results while being cheaper and easier to use.
Lenses will have much more effect on what your images look like. For landscapes get a wide zoom like the 28-70 2.8 and some fast primes at last as fast as 2.8.
Stay away from Non-Nikkor glass generally unless it is the new Sigma Series or Zeiss.
