Want FX but not impressed by D800 build quality

Part of the joy in photography is in the connection you have with the equipment you use, the ergonomics of design, how tactile buttons and switches are. Today I tried out the Nikon D800 and was very disappointed in the feel of the camera; coming from a fully magnesium body D200 I was left with the sense of plastic. I want to move to FX but will not be doing so from either D800 or D600.
What choices are there beyond Nikon that would enable me to continue to use my Nikon glass on a FX body that is actually a pleasure to use?