Verzejd,
You might want to provide a little more detail about how you are going to use the knife.
Since you posted here, I'm gonna guess that you want a fighting knife. If so you might want to ask your instructor what type of blades he prefers and what might work well with what you are learning.
Personally, I like Strider knives and the GS is my favorite fighter. I look for speed, balance, blade shape/stlye and grip. After hiting some hard targets, I find that cord warp knives offer some very good grip retention. Besides, Striders offers trainers that simulate the blade. If you are going to learn to use a fighter I think it's a good idea to get a trainer for any knife you plan to use that way.
Good luck in your search,
S.