Thanks for the replies. My passion at the moment is wildlife, but I also like portrait work and shoot at family get-togethers in bad lighting quite often. That's why I'm stuck.
The best option would be both the D700 for low light and D300 for wildlife, but that is too expensive when I include new lens purchases. (17-35mm at a minimum if I go the D700 route.)
Worst case with a D700, I crop the image to get the FOV I'm used to, but then I loose valuable pixels if I want to print large. However, after the crop I'm right back where I started with my D70 in terms of additional cropping. (A cheat until I can afford the 200-400mm.)
An FX with more pixels would be the ultimate FX/DX combo, but I don't think I can wait on a model with a high enough pixel count to make cropping a wash, not to mention that it would be much higher in price than the D700 anyway.
I'll wait until some reviews from actual users start showing up to make a final decision. Both cameras have some excellent pluses, and both have a couple of minuses. I'll just have to weigh the good and the bad.......