Reading this thread has made me realise just how
little I actually use my D700

, compared to my D90, but on those rare occassions I would nominate;
1.
Nikon 70-200mm f/2.8 VRII - a marriage made in heaven, with the best VR I've ever used (very useful at the longer FLs, BTW

) and balances well on the body too.
2.
Nikon AF-s 300mm f/4 - incredible sharpness and very portable for its FL, too. Admittedly though, I use it a lot more on DX as a 'birding' lens than for anything else :shake:.
3.
Sigma 50mm f/1.4 - hard to beat for silky bokeh, although I tend to use it stopped down a bit for portraiture, having got over the novelty value of seeing the world from an ants perspective at f/1.4

(where only a tiny fraction of each subject is actually in focus, as it would probably look to an insect

).
I must be the only person in this thread to have started off digital photography with FX gear and migrated to DX :| - what a wierdo

!