Fenriz? Since when is he a vocalist? Nocturno Culto does the vocals for Darkthrone.
My favourites are Ihsahn, ICS Vortex (I'm not worthy), Vintersorg, Galder (dunno why, I just love his voice), Garm (I'm not worthy), Nocturno Culto, Satyr, Atilla (weird choice, but I think his voice is very cool) and the guy from Carpathian Forest.