All three of these are beautiful pieces, but for me, Knife C just struck me. The modified clip point gives the blade the belly to do some severe damage while the convex top edge looks and probably functions extremely well. I think for this sort of speciality design, a steel like ATS-34 would do just fine...after all, if you're concerned about edge holding in a dedicated fighter, you have inflicted a good deal more violence than necessary to disable an attacker.
As far as what I would change...hmm...since it IS a fighter, I would maintain the sharpened back edge. I think it might be worthwhile to cover more of the tang with scale material...as to assure a more secure grip.
Robert, beautiful knives.
Nitin (nitin00@hotmail.com)