"D700 Keep in Mind FF cameras make your lens shorter"
Not shorter, just their actual focal length relative to 35mm as full frame. The DX perspective doesn't "multiply" the focal length, it simply crops the image in terms of sensor capture size at 2/3s the original size relative to the 35mm standard. Just remember that you can accomplish the same perspective with either the in-camera DX mode of the D3 and D700, or with post processing. However, the big difference is in the sensor pixel count, and that's where the D300 has an advantage in ultimate resolution for the same field of view. But obviously there are other advantages to a larger pixel in the FX mode, not the least of which is light gathering ability resulting in the superb high ISO performance of the D3/D700 sensor. By the way, this sensor is not a Sony design, but is a proprietary Nikon design produced by an undisclosed manufacturer. The "potential" 24-25 megapixel sensor D3X will likely utilize the Sony one of this size.
OldPhotos "If everyone possesses some measure of this intangible quality called creativity, photography is unprecedented as an outlet for its expression." - Ansel Adams