I haven't treid the Nemesis head, but I have a 2x10 nemesis cab, with a LittleMark II as the head, and I love the sound. I will, when my pockets allow it, be adding another cab to this.....probably a 1x12 or 1x15.......but the LMK is definitely the best head I have ever played through (although, admittedly, that isn't a large number).
Sorry I can't help in any other way.