So, my biggest frustration with my current camera is that it does not take prime (fixed focal length) lenses. I am limited to the zoom lenses with built-in motors (Nikkor AF-S).
However, Nikon has just announced a lovely and fast prime lens with an AF-S mount at Photokina: the Nikkor AF-S 50mm f/1.4 G. The only downsides are the price (>$400), and that it is a “G” (i.e. gelded) lens, meaning it does not have an aperture ring: aperture control is electronic only. So, it looks like I may be able to put of blowing $3000 on a D700 body.