For medium size knives:
1. Lawman(surprised no one mentioned it yet) - Lawman to Cold Steel is like what a 710 is to Benchmade. It's the first Triad lock that started it all, just like 710 is the first axis. Not to mention that it's the closest substitute to popular knives like PM2, Manix 2 or Griptilian.
2. Ultimate Hunter
3. Mini Recon 1
4. Code 4
Good way to characterize the American Lawman.
In addition, I would include the Ultimate Hunter, the Code 4 and the Recon 1.
Honorable mention to the Hold Out 3.
With knives as solid as these, I don t have a personal need for a fixed blade.