I just might get a 14-24mm lens for the D800 if it works out, and it is off to a good start.
Do it. The Nikon 14-24mm lens will blow your socks off unless you have experienced something similar before. I went ahead and purchased it for my Nikons back before the tsunami (thankfully!), and it's a rock star. I would own it even if I didn't need the extreme wide angle capability. The only bad thing is that I am used to lenses that go to f/1.4. People brag about lenses like the 16-35mm II or the 10-22mm, and they don't even live in the same world as the Nikon 14-24mm.
5DIII, 5DII, 7D x5, 6D, T2i, T3, 1D X, 10-22mm, 16-35mm II, 18-55mm II, 18-135mm IS x2, 70-200mm f/2.8L II, 24mm f/1.4L II, 50mm f/1.4, 50mm 1/1.8 II x2, 85mm f/1.8 x2, 100mm f/2 x2, 135mm f/2L x2, 200mm f/2.8L II x2, 1.4X III, 2.0X II, 60mm f/2.8 Macro, etc. only had room to list a few Canon items