>By contrast. there are many things a D7100 can do that a D300s >can't (like shoot at ISO 6400 with the same noise that a D300s >has at ISO 1600, crop the bejesus out of an image, and allow >for much better dynamic range). Plus, I think the center >sensor can AF at f8, which can be useful with teleconverters. >The AF system is newer. The metering algorithyms are newer. >I don't know anybody who can't stand to benefit from those >improvements. > >That said, you're still using a D200, so a D300s would be an >order of magnitude jump for you. I have a D90, which has the >D300 sensor in it. It is vastly inferior to my D7000, which >is a generation behind the D7100.
I am green with envy about the D7100 sensor. If it was in a D200/D300 like body, I would be all over it in an instant. But for now, I steer clear of it - after testing it for a week. I did look at your hi-ISO examples in your gallery.
Meanwhile, here is how I deal with low-light high-ISO with my old tired D200.