SRK and Seal Pup have hollow handles, meaning the tang does not extend top to bottom in the handle. If you are looking for a survival knife, this is a big no-no. You will be using your knife to do what is called "batoning", or, holding the knife against a log/tree/branch, etc, with your non-dominant hand then whacking it with a thick branch, stick, rock, etc, to cut the wood. With a hollow handled knife like the seal pup or srk you'll just end up breaking your knife. Now, if you want a fixed blade to carry in an urban setting or around your friends just messing around, SRK or seal pup will be fine, but in a survival situation they won't be able to perform.
The entire Ka-bar becker series, specifically the BK2 or BK7, would work perfectly. I have a BK7 and personally it'd be my first choice in any survival scenario. I cut down trees, cut firewood, rope, etc, and kill zombies with it. The Becker series is fantastic.
As for serrations, there isn't much use for them in my opinion. A small, fully serrated blade, is good to have with you when sailing but that is about all serrations are good for in my opinion. A big survival knife should be and will be able to cut through any rope in one swoop. If it doesn't, you needed to sharpen your knife a month ago.
As for the spear, just get a knife that can turn a branch into a spear. You won't get the same penetration power but then again you won't lose your knife, break your knife, or be completely disarmed if you throw the spear. If you are dead set on making a spear, get a $10 fixed blade from china and make a spear out of that.
http://www.ka-bar.com/knives/
On the left side click "designer" and choose "Ethan Becker." Pick one of those.