I really like the Nikkor 200-400mm f/4 VR lens. Goes for about $5000. That would probably first on the list. I'm still unsure if I'd like the full format digital, ie: Nikon D3 at about $5,000, though it can also be used as a crop body with DX lenses, but only at 5.1MP.
I originally thought about putting the D300 as my top choice, but I think I can find a way to purchase that sometime next year. At least so long as my wanting a REALLY REALLY nice (and almost just as expensive) bbq smoker doesn't get in the way.