I've found that center-weighted metering gives the best results for concerts, unless the subject fills the frame, in which case I use spot-metering. This is particularly true for rock concerts, where light is changing rapidly. That doesn't seem to affect center-weighted as much as other metering methods, simply because it's less exact. I mostly dial in EV -1, but that may vary by as much a +/- 1EV.
Another challenge with rock concerts is the vibrations. At this one, I took many shots hanging by one arm and one leg from one of the loudspeaker towers. Apart from the fact that it's uncomfortable, I tried to click the shutter between the beats, since the deep bass blurs the photos.
The high ISO limitations of the D80 is a challenge too. If I was doing this for money, I would probably have to buy a D700 or D3s, but they are rather big and heavy, and FX means larger lenses as well. A Pentax K-x, with its excellent low-light capabilities, would be a cheap alternative, and the Pentax primes would be exactly what I need, but concerts are just the situations where one needs to see what focusing point is active, and that's not a feature on the K-x.