Ya' know...those Taurus Titanium .357 and .41 mags are lighter than alot of serious blades. But, guns aren't for everybody, so perhaps that's a moot point...
When it comes to choosing weapons for personal defense, I tend to believe that no blade is too big, and no firearm is too powerful.
That being said, I'd suggest a Spyderco Perrin, or Temperance. Ideally suited for fighting cougars? no, but no knife truly is. It will take good care of the random tasks that arise the other 99.999 percent of the time when you're not getting into knife fights with cougars. Also, both of those knives are well suited in the reverse grip, which is a pretty quick draw, and possibly preferrable if what other guys are saying about them being ambush jump on yer back kinda hunters is true. Uhmm.....not that I've ever been in a knife fight with an animal, but hypothetically.....
Regarding people who have had it out with the animal kingdom with bladed instruments, there's one main situation that comes to mind.
During the Iditarod one year one of the mushers came across a pissed off moose, and for some reason could not get to a firearm. Instead wound up killing the moose with a camp axe. Took a couple hours to do it though.
Also heard a less verified tale about a guy killing a grizzly with a Kabar. As I heard the tale told, he curled up in the ole earthquake position, and whenever he got a chance to he'd thrust or slash the grizzly, before it began mauling him again. Surprisingly the bruin ran outta blood first I guess. The first tale I heard on the evening news, the second one was just passed person to person, so it could be one of those "Alaska style Urban legends"