This post reminds me of this guy I saw on "Iron Chef" who was famous for having the larest cooking knife in all of Asia. I'll try to find a picture...
http://watanabeblade.com/english/pro/kuro.htm
These knives are hand forged, high carbon steel, and hallow faced for faster sharpening. If you want toughness, sharpness & longevity, then this is my suggestion.