Get a new d90, getting used is a big gamble with bodies as TCav said. If something fails it is expensive to repair, and nikon will charge you a pretty penny.
Super Frequent Flyer, no joke. Ex Patriot and loving it.
Canon Eos 60D, T1i/500D, Eos1, Eos 630, Olympus EPL-1, and a part time Pentax K-X shooter.