it's hard to beat a Spyderco Delica. This one has stainless steel scales, and a vG-10 blade. Very close to the perfect EDC knife.
My vote too. I've carried the same one for 15 years now.. lost two of the same before because its black plastic and easy to lose. I have a shoe box full of knives I could carry and would buy a delica if I lost this one.
I have a partial serrated one and would opt for a normal blade unless you want twine cutting capability.
Several engineers at work carry these in the office and use the pocket clip as a money and credit card clip.
Its a thin & tough knife.