I own a D80. It is a very good choice, with most of the features (main sensor, 11 autofocus sensors and pentaprism viewfinder) of the pro D200. It will take most Nikon lenses, but will obviously only autofocus with AFS, AFG, and AFD lenses. You can use some older lenses but will have to focus manually. Which lenses do you have?
An excellent review of the D80 (and other models) can be found here:
http://www.bythom.com/d80review.htm
Don't be put off by the amp noise discussion. The review posted above looked at an early production model. On my D80, amp noise is not an issue.
If I have to buy again today, I would also seriously consider the D40x. It is also 10mp, with a pentamirror viewfinder and only 3 af sensors compared with the D80. The D40x only works with the modern AFS lenses.