Canon 5D Mark II is the most attractive full-frame DSLR camera, which is conveniently also the most cost-effective among full-frame cameras, if video capability matters.
5D Mark II is a 2008 technology. Will it be updated to 5D Mark III in 2011?
As you can see, Canon 5D Mark II and Nikon D700 are both entry level full-frame digital SLR cameras, but D700 is not video-capable.
If I were to upgrade my digital SLR now, 5D Mark II will be my only choice forward, nothing higher, nor lower. Unless something better comes up.