Alright, well, like some metalheads (although not MOST) I love my music original, the band HAS to have something about them that seperates them from the crowd and of course from being pulled into the cesspool of crap that is emo.
Here are some bands I love, not strictly, but perhaps mostly for the fact that they are original sounding:
Skindred - Reggae Metal? Their vocals are pretty damn nice, although can be repetitive.
Alestorm - Scottish Pirate Metal. Again, the vocals (due to accent) is amazing and being Scottish myself, respect the fact that they done a version of Flower of Scotland (our National anthem) which is KICK-FUCKING-ASS.
Soilwork - I'm not entirely sure why, but none of their songs sound the same (you know how bands do that, and it spoils them).
Post up any bands you believe are original and if you can, their reasons.