Why buy a D7k? Because I have a d5k that I have grown out of in less than a year. I love the IQ that it provides, but the view finder is small and just plain sucks. The hand grip is too small, and I'm tired of going into menus to change settings. I really wish I would have bought a D90. I was considering a D90 or even a D300S very soon but now I'm really excited about the D7k. For me, a D300S is almost too large and it's $600+ more expensive than a D90. Why would I buy a D7k over a D90? Better ISO, better AF and metering (assumption).