Andy -- Don't get tangled up with the memory card issue concerning the D800. I recently added a D800 to my existing family of two D700 bodies and am using the same CF cards I used in my D700s. The only problem is that an 8gb card holds only 90 14-bit RAW + a medium JPG versus the 250 such captures I get on the D700. But there is NO requirement even to install an SD card. Maybe I will acquire some in the future, but I am using the D800 daily in my business with 8gb and recently, 32gb compact flash cards and an empty SD slot. The other questions you have to answer first are what you plan or hope to get from an FX camera and whether your finances will support those goals. Someone else in another thread recently noted (a) that existing cameras don't suddenly start taking bad pictures when a new version is released, and (b) it is easy to blame the tools for bad carpentry. The issue of lenses is also germane, although if and when you can acquire top-shelf glass, it lives beyond camera bodies. Going from the D700 to the D800, I have found no need to change or add lenses. BTW, I have a friend who is pretty anal about lens quality and who is raving about the new 70-200 f4. In addition to being very, very excellent, he notes it is a lot lighter at the end of a long day.