For something all purpose, do whatever you want, only fixed blade to carry, and cheap, I think I'd look at one of the inexpensive Mora's, or I'd get a Kabar with a kydex sheath, in a length and color you liked. Altrernatively, I'd buy Kukri from coldsteel.

Hhhmmmm, I seem to have already bought these.

Anyway, a good knife is something you are fully prepared to both abuse and take care of. It's kind of like a drag racing car. If you are not fully-prepared to risk breaking it by just stomping all over it, and do so with a lot of ummph, because you know you are not that likely to damage it, then why have it. A knife is a tool that needs to be able to take abuse, and you need to be willing to dish it out.

At the same time, it should be something that you not only are willing to take care of, but enjoy taking care of. Like shining a old pair of shoes you find as comfortable as slippers, and to which you are loyal.

Any of the above can be that kind of knife, and for $100, you can buy all three, and have money left over.