I'm looking to upgrade one of my two cameras (D200). Currently I have a D300s and a D200. I mainly shoot mountain bike racing, but occasionally will shoot an indoor concert or portraits of the family. My main lenses are a 70-200vr, 17-55 2.8, 50 1.8, and 35 1.8 (mix of FX and DX). Shooting mountain biking the lighting goes from full sun to heavy shade in the woods. AF performance is important to increase the keeper rate. It looks like the cost of the D700 and D7100 would be close ($600 vs $800). Neither are "new" bodies, but the D700 is definitely the older of the two. My biggest issue with the D200 is noise at higher ISO. Any thoughts on these options or other suggestions?