Recommend a good survival knife

Get 3 of these under $50 shipped

I got the Clip point, the Tanto and the Bolo for $45 and change shipped

Since you probably don't know much about edged tools, I'd recommend something simple and to the point:
Try the Cold Steel Bushman. It costs about $30 on Amazon, and is a good all around blade. It is made of one solid piece of high carbon (the best) steel, and the handle is hollow so that you can simply pop in a sapling, broom stick, or any straight shaft to make a fully functioning spear. Very handy as a quick defense/offense weapon.

more than $50 but completely worth it.

[link to www.survival.com]

More than $50, but excellent.

[link to www.kabar.com]