The D50 makes an ideal back-up to the D80 - that was my previous combo![]()
I love my D50 and would only upgrade to something like the D300! The only drawback for me personally is that I can't manually white balance.
A few other differences between the D80 and D50...
Flash commander.
Viewfinder size.
I used to have a d50, great camera, and upgraded to a D70 (largely because I fancied the front wheel)