I look at my D700 like my old F3. In film days i went from Nikkorex F to Nikon Photomic T,FTN and then the F3 which I thought was perfect. I kept the F3 until I bought my d200 then updated to the D700 and so far I have not found the urge to upgrade further. The camera does everything I need. If I do eventually want to upgrade, I share your concern, as the D700 was almost a perfect compromise.