You can't go wrong with ESEE or Becker. Don't get anything that's not full-tang construction, especially if you want durability.
EDIT: Based on personal experiences, this forum and youtube, I would stay away from SOG and Gerber. They just can't compete with ESEE or Becker in bang-for-the-buck durability and warranty. If you somehow manage to break an ESEE or a Becker (never heard of it happening but not saying it hasn't) batoning or chopping, they will fix or replace it with no questions asked. I know from personal experience that SOG and Gerber will tell you their "survival" knives aren't meant for doing simple wood processing or bushcraft tasks, for example: batoning and chopping.
Besides Tops and Busse(both practically out of budget if you want sheaths), I can't think of any other knife companies that are more "hard use" than ESEE or Becker. Between ESEE and Becker, obviously I prefer ESEE because I think they offer better sheath options and I like Micarta. If you buy a Becker and then buy extra Micarta scales, for the price you might as well just buy the ESEE and have them hand fit from the factory and have a better sheath. I'm not trying to knock Becker, btw. I think they'd be an outstanding choice. ...Soapbox over.