I carry a Columbia River Knife and Tool M16 with a tanto blade. I'm not a knife guru, but I think it takes an edge pretty well, and has done everything I have asked of it. Granted thats not a whole lot, I haven't tried battonning it yet, and I'm not sure how it will stand up to a car door or if I can jimmy a lock with it, but it sounds like the fixed blades you carry would all take care of that. The pocket clip is pretty good: I was carrying it when I crashed my bike once it stayed put.
If you just want something small and razor sharp, I picked up a SOG Micro Fusion II at Sportsman's the other day. Crazy sharp edge. Again, I haven't had a chance to see how it does when the leather hits the pavement.