Here's a few ideas:
Buck Hartsook (S30V steel)
Buck Mayo Kaala (S30V)
Benchmade Instigator (AUS 8)
Chris Reeve Professional Soldier (S30V)
Benchmade Activator (S30V)
RAT Cutlery IZULA Neck & Survival Kit Knife (1095)
Tons of commercial options out there, with a huge range in price. Even more options if you start looking into the custom stuff or have custom sheaths made.
(Sorry if the pics are a bit large.)