I've sent in my D700 to Nikon for some general cleaning, grip replacement, and exposure issues. They provided me with a cost of non-warranty repairs which I paid. Came out to $175. I just received a call from them stating that they are unable to get some parts that are no longer manufactured. In turn, they are offering me a factory refurbed D750 at no extra cost. I've had my D700 for 7 years and love it. One big issue will be that my MB-D10 battery pack will not work with the D750. And for my shooting, I desperately need that, mainly for shooting portrait orientation on the fly. I haven't priced the newer packs but I'm sure at least $400 for that. I do "like" some features of the D750 that are missing on the D700, such as wifi and video. The double megapixel count means nothing to me though and it concerns me a bit with the lack of the flash sync port for off camera flash. I don't use that on a regular basis but can be an issue down the road I'm sure. What would you do in this scenario? Keep the D700, accept the refurbed D750, or ask for something more?