Ask the Nick: What folding knives should every knife collector own or try?

Today, I answer a viewer question, and talk about the knives that I believe every collector should own (or at least try for a little while). Here's my full list:
* Opinel
* Ontario RAT 1 or RAT 2
* Kershaw Blur or Leek
* Spyderco Dragonfly
* Spyderco Delica or Endura
* Cold Steel Recon 1 or Code 4
* Spyderco PM2
* Benchmade Griptilian
* Benchmade 940-X
* ZT 0452CF
* ZT 0562CF
* Cold Steel Espada XL
* Spyderco Slysz Bowie
* Chris Reeve Knives Large Sebenza
* A Shirogorov or Grimsmo or Thorburn or Carter Prime (a knife with an insane drop-shut action)
* Some high-end handmade custom knife
* Some piece of Gas-Station Crap (like a Z-Hunter)