I shoot on a D300s. If you have a little extra $$ go for the 'S' model. I find the high ISO noise to be lower.
I shoot sports, which require shooting 500 - 1000 frames per event. At 50,000, I like to send back to Nikon for clean and calibrate. That costs roughly $250. Lately I find that trading in for a refurbish model is only a couple hundred more, and I have a brand new camera.