Having cut the defenses down to two, I think it's also appropriate to simplify the ability scores. For now I'm going with four scores, rather than six, as follows:

Power, Agility, Savvy, and Mettle. Among other things, Power adds to damage rolls, Agility adds to initiative rolls, Savvy adds to skill rolls, and Mettle adds to hit points.

Anyway, aside from the item stuff that's about as controversial as I expected, do you guys think that the core mechanics here are worth exploring?