Yea, to make it short I want / need a big, tough camera, and since I always loved shooting the D3 from work I'm going to get my own soon I hope (Canon 1D whatevers not being an alternative, as Nikon fits my hands much better, though if it was just about the lenses I'd get a Canon)..
Screw type is faster, generally.
Why the switch? Also, are you going full frame?