These are the knives that I've been carrying recently, listed by size.
For a small knife, Spyderco Dragonfly. I've found nothing thus far that I like better for a fully usable small knife.
For my purposes, medium is a knife with a blade 3" or slightly less in length. In that range, I rotate a Benchmade Mini Axis Stryker, Benchmade 707 Sequel and an Emerson Mini CQC7BW (that I have "de-Waved").
I no longer carry anything really large. My largest knives only have blades around 3.5". So these are my "large" EDC knives using my definition: Benchmade Axis Stryker, Benchmade 943 or an Emerson CQC7A that I've reprofiled to a standard double bevel edge.
I've recently bought both an ESEE Izula and a Candiru and I've been carrying one of those in addition to a regular folding knife. I'm not sure where these knives might fit into the rotation but I like them and may continue to use them.