I also bought another lens last year my 80-200 Nikon 2.8 and also bought the d7100 late last year so I got close to 10K also in camera gear spent. Instead of buying the 70-200 2.8mI elected to have the 80-200 and the 300MM prime for the same bucks. The d7100 is my track meet camera and with the 1. 3 crop I got 600MM on the pirme lens. if I had to buy the 600mM prime for my d610 it would be 10K just for that lens. If I want to buy the D4S I could right now with what in my toy budget . But restraining but thinking real ahrd about the D4S except it wont do 600MM with my 300MM lens.