How about the cold steel kobun? From what I have heard it is a lot of knife for the money. Lightweight and durable.
The blade tech pro hunter magnum is an amazing knife. The blade is s30v steel and sharp as hell. Anything made by blade tech is awesome
I have a Gerber Guardian Backup as my boot knife/self defense knife. Small, lightweight, but sharp as hell. Very good knife as well as sheath, which is a major part of a self defense knife too.