Ted made some good points, if I meant ultimate as in the one I get the most use out of it would be the SS4 undoubtedly and it is made of the ultimate steel.
I think the D Mutt is going to be more usefull than most people think. It should do pretty much everything a S6 does but the inch less makes it much easier to carry. It really is the most knife you can comfortably wear.

"if you want to be a hero you have to learn to drive stick"! Sara Conner