My EDC rotation consists of knives (all folders) that I can afford to lose or break and not cry about. Depending on your preferences and requirements, some of these may not apply, but I have carried each of the following at one time or another, either for extended use or just for a "trial run" immediately after purchase.
Kershaw: Scamp, Vapor III, RJI, One Ton, Groove, Lahar
Gerber: Gator, Armor
SOG: Salute, Vulcan Mini, Trident Mini
Cold Steel: Recon 1 (tanto)
Boker: Gemini Badger
CRKT: Drifter, Ripple
Leatherman: Crater
Of the above knives, the Vapor III is my usual workplace EDC (along with a Leatherman Wingman) and the RJI is my "out and about" defensive knife. I originally bought the One Ton for more of a hard-use folder, but don't feel that it is quite what I was hoping for, although I do still carry it frequently. None of them has been unsuitable or otherwise below my expectations in terms of quality. As you might guess, I've found that I prefer Kershaw.