If you are going to throw your fighter for either fun or defense the main thing you want is durability. Balance means nothing, as for anything you throw will rotate in a specific way around its center. You will quickly learn how to make it stick. Look for a full tang fixed blade with a durable handle and at least a 3/16" spine. The length is up to you. I don't throw anything under 10" and prefer a 14" thrower. There is large assortment of steels to choose from. Stay away from steel that is too soft for a fighter or too brittle for a thrower. This still leaves 90% + of current steel available. You can spend a little or a whole lot and still get what you want. IMO get a inexpensive knife (no Pakistan stuff, too soft) and beat the hell out of it. Expect to file out nicks and dents if you throw it often, no matter what steel you get. IMO, throw a stick, rock, dirt, anything as a distraction so you can use your knife more effectively. NEVER throw away your knife unless you are in extreme distress and have no other choice.