The 70-200 works great on the D3 except along the edges at 200/2.8. Frankly this is a non-issue in most situations.
The D700 is the camera I would have chosen last year but now I've had the D3 6 months with many thousands of great images and I'm philosophical without regrets. The rock solid feel, crisp shutter sound grew on me and I even use 9fps on a fairly regular basis. I dropped the camera 3 feet onto a stone floor on my last vacation and it works perfectly without even slightest mark on the body. I wonder how the D700 would have handled that.
I think the D700 is a great camera for Nikon and for photographers - take that Canon. If I didnt have the D3 I'd order one first thing tomorrow. For now I'm patiently waiting (still) for new prime lenses.