Do you carry a "cheap" or "expensive" EDC knife?
I know that doesn't mean the same thing to everyone, so lets say under $50 is cheap and >$100 is expensive.
I own a couple decent folders, but I've also managed to loose a couple knives in the last 20 years, so I'm shy about carrying a blade that cost >$100, or is now out of production and becoming a collector knife. There are so many great knives for bargain prices, there's no need to spend a lot of money unless you really want a particular design or manufacturer.
Currently looking for my OKC Rat 1, which IMHO is one if the best bang for the buck, do-it-all, knives. Thin enough to carry, big enough for self defense, good enough steel. It's borderline too large for a lot of detail work, but the benefits outweigh the negatives. Of course, it's currently MIA. I know exactly where I used it last (in the house), but it's been teleported to parts unknown.
Until I find it, or buy another one, it's a Spyderco Paramilitary 2. Nice and thin, great lock, good steel, and a lousy clip. It rides way to high for my taste, and it feels like it's going to come out of my pocket.
I carried a Boker, Wagner-designed, automatic for several years. Lost it for about six month (found it in my company truck, under the seat, wedged between the seat-belt mechanism and the center console). It's in my nightstand these days.
Back in the day, it was a Buck 110 in a belt pouch. Still a really great knife, but it's really heavy for what it does and hard to open quickly.