I always have my Buck pocket knife, every day, pretty much everywhere. I have to be careful @ work, can't wear an obvious folder. I have a little CRKT model that fits nicely in the 'fob' pocket of my jeans for outside of work. Currenty carrying an Ontario RAT II.
SOG assisted opening Aegis w/ standard blade. It's light (3.1 oz), unobtrusive in my pocket, feels great, and the blade is just the right size and very useful. I have other knives, but this is the one I always seem to grab. It also comes with a black handle.
I also carry a Kershaw Leek, though with a half-serrated blade to cut rope and cord more easily. You're just a week too late, but Kershaw has a big annual factory sale the first weekend of December at their Tigard facility and you can buy knives at up to 75% off retail. I buy two or three Leeks at $15 a piece and don't worry about losing them over time.
The wait to get in to that sale is LONG! I have waited two hours before just to get in the building, and learned to bring a friend for company or a book for the wait. I still figure that if I go in with a $60 budget and am saving 75% from retail, it's like paying myself $90/hour to stand in line.
Had one; amazing little blade but smaller in person than you may think. Definitely get hands-on with it before committing. But again, really nice and idiotically-sharp if even base-level care is given.