F90x is one of nikon's finest AF cameras ever!
I had one for years and it never let me down. I now use an F5 if i feel like shooting 35mm but i still miss the f90x from time to time. Its light and robust.
with F90x you can use the MF lenses and get metering. But you don't get VR with the new nikon VR lenses. Also in many situations f90x shows better AF performance than F100 and even F5 sometimes.
Don't waste your money on a F80.. get the F90X