Who makes the strongest/toughest pinions?

Allright, its time for an overhaul on "Frostbyte" and I was going through and stripping the truck down to its essential to look for wear and I was surprised to see what my stock 20T pinion gear had been worn down to.

Needless to say, the torque and power from even 4S is pretty amazing for it wear down like that. So I need to replace it with the strongest, toughest pinion I can buy that will last longer then the stock HPI one. I've heard lots about Robinson Racing but apparently Castle Creations also makes hardened pinions for their motors as well.

Thoughts, suggestions input would be greatly appreciated. I'd like to stay at 20T for a good balance of power,torque and speed.