Thank you for your swift reply and I give thanks for adding another element to it because I think the d300/d700 combination speaks to the same case as mine as well: the dx/fx combination's advantage.
I have been thinking about the d300/d700 combination. The weight of the d3 I am not worried about at the moment (however, a few hours of using it and I might say differently.) On first impressions when holding the d3, I did fall in love with just how solid it was. I do have a tendency of being in situations where the more rugged the body the better, so that's one reason I am swinging towards the d3. In addition, the weight of the d700 by itself when it is bare, is half a pound lighter (from what I've read?) but once you add the grip and extra battery it can go up to at least 2 more pounds. Since I would be shooting mostly with the grip to gain the extra fps, I figure weight is actually lighter with the D3.
Still, I definately should be considering the d300/d700 combo as well.
Thanks for the very helpful input Vincent and congrats on the D700 order! ____