It depends on what your intended use or objective is.
1. just to have fun and amuse yourself, then anything that is comfortable and produces results is acceptable.
2. If you are a serious competitor, then I would go with one of the custom/semi-custom knife makers such as Bobby Branton of this list.
3. If you want a competitive level/style knife without the serious competition and you are looking for a mass produced model, then your selection is very small. If I was in this catagory, I would get a set of the cheap Pakistan bowies from one of the knife catalogs (around 15 bucks each) and modify them for real throwing. They are the right size, right weight, and have that serious thrower look.