KING'S X
I try to see them once per year, as they always come around to NYC in the Summer. I've met them before and after gigs several times, and they've always been super nice and appreciative, signed my CDs, chatted gear, etc.
Live, King's X is just MONSTROUS; what Cream should have been. Seriously. The live version of Monajam blows away most other instrumental tracks, which usually feature flash over substance.