The Nimravus is a pretty decent knife, but it's pretty low down on my favorite fixed blade knives, for one major reason--the handle is rather poorly designed, IMO. The handle scales leave the tang exposed, and if it gets cold or hot, that exposed metal can get downright uncomfortable. It's probably worth investing in some slightly wider custom scales for the knife. Other than that, it's got some nice jimping on the back of the blade, and gets pretty good control. The 154CM isn't Benchmade's best steel, however, IMO. It's a lot harder to sharpen than I would prefer.
I kinda like Cold Steel's Peacekeeper 1 for a defense knife. Mine cost around 95 USD. Aside from the long double edged dagger blade, it's got a fairly flat profile, and it's a lot more comfortable than the Nim is for me. Might be worth looking at.
Other decent knives you might check would include some of the ESEE offerings and the Bark River Bravo 1.