Personally, I carry an Emerson CQC7B and a Benchmade (either the Kulgera or the 940) at all times. Sometimes, I also carry the Spyderco Military. If I'm biking, a Benchmade 530 (extremely thin and light, sometimes I forget it's there) is clipped to my bike shorts, and the Emerson is either in the saddle bag, or on the strap of my pack.
For a lower cost option, I do like the Kershaw Leek (have the combo-blade with the D2 edge) a lot. It's slim, light, fast, and not at all intimidating to sheeple (easy to dress up with, unlike the Emerson or Spyderco Military).
That said, the Leek doesn't give me the confidence the other knives do tho. All the other knives feel VERY VERY solid, and I don't think about having to me careful using them. Just because of the size and weight of the Leek, I'm usually a bit more delicate with it. Don't get me wrong, it's very well made, and well put together.. .it's just not beefy like an Emerson or a ZT or the expected HEST/F.