Like you, I love to have both DX and FX equipment and I use both frequently. I also have both the D300 and the D700 as well as the D2x and D2h and D3s. When out landscape shooting I always carry two bodies with two different lenses. I particularly enjoy that the D700 and D300 are practically identical although I have MB-D10s for each of them.
Interestingly I also have all of the same FX lenses that you do except one. I am eagerly awaiting the release of the D400.