When I decided to upgrade from a D70s I talked to a lot of people on Nikonians that were selling D300's. I managed to purchase a D300 with around 11,000 shots on it. There are a lot of people that in some cases are selling back up bodies or just get out on the weekend to take pictures. Personally I like to try and buy used with as little activations as possible. That also reflects in the overall condition of the body.
PS: I put that D70s up for sale, it only had 351 shots on it. It sold in one day.
good luck hunting, there are some really good deals on this site.