Yeah I agree that GNR really isn't metal, I had trouble putting that on the list. AC/DC is defiantly still rocking, I have seen them live many times over the years, always a great show. If I had to add a few more, lets not forget...
Faith no more, the real thing
Blizzard of ozz
Iron maiden Piece of Mind
SOD Speak English or Die

I'm sure I could come up with a top 10 list of "not quite" metal bands as well.