If you can find a Swamp Rat HRLM, you will never settle for another knife in this size range again. They aren't cheap at around $200, and can be hard to find since they only pop up on the secondary market (Blade Forums is a good place to look), but they are one of the best survival/hunting/utility knives ever produced. The steel is a modified 52100 tool steel like what is used in industrial jack hammers...extremely tough. The design itself is perfect for general utility, and you can baton the crap out of it without any concern for damaging it. It has excellent ergonomics, and the blade geometry gives you a lot of working blade in a relatively small knife. I keep one of these in my hunting bag and in every BOB I own. Not a small investment, but who here will spend a grand on a firearm without batting an eye? When the ammo is gone, the knife will be your life, so buy the best you can afford even if you have to scrimp a bit on something else.
If you want to be prepared for a starring role in Naked and Afraid, then grab a Swamp Rat Chopweiler. It's the big brother to the HRLM, and it is the toughest knife you will ever find. Chop down a giant redwood? No problem! OK, maybe a little tough, but not impossible with this knife. I've personally chopped down trees 8" in diameter with it though, and while tiring due to my being 55 and a little past my prime, it wasn't as hard as I anticipated. I keep mine in a Spec Ops sheath with a Leatherman and a fire starter in the pouch. With this combo I think I could rebuild civilization if needed. There are videos on people torturing this knife (chopping thru concrete block and metal pipe) without inflicting any damage to it, so rather than describe it here, I'll just tell you to Google it. Swamp Rat (Busse) has an almost cult-like following that is based on performance unlike anything you will likely see with any other brand. Few other makers build knives that create such performance-based passion, so maybe you should ask yourself why and take a look. It's one of those things you just have to try to truly understand, but once you do, you kick yourself for not having done it sooner. Sort of like when I discovered Cutco for the kitchen, but MUCH better.