Yeah Chris, I have a serious amount of camera envy. The D700 is on my list for the future.
The 300/f4 on the D300 sparkles and produces some great shots (see the jetphotos link in my signature, the pics are labeled with which ones were taken with the 300mm). I can only imagine how it looks on the D700.
Although I'd love to have the 300mm/f2.8 or 400mm/f2.8 on the front of it.
Something to look forward to.