billydoo73
TPF Noob!
Certainly what billydoo said is true but the OP just bought a D700 and has option to return and buy the latest and greatest with only a few more dollars.
but is it the latest and greatest? at 36mp, you better have high quality pro glass and excellent technique. otherwise, those 36mp are going to haunt you. the D700 and D800 are going to perform almost the same in low light. etc.
the D800 is a GREAT camera on paper, but sometimes you just don't need the "newer version." even Nikon says the D800 is "Along side" of the D800, not a true replacement.
in any case, it's your money and you know what you need. if you need 36mp and video then go for it!