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I second mister wilburn. I have the MOD CQD and CQD Mark II manual, and the CQD Mark I auto. I also have a Microtech SOCOM Elite. THAT is one sleek but tough knife, and a good knife for EDC under any circumstances. Of course, mine is one of the old skool. The current versions are just as good, though.
The MODs are all but indestructible, great for the field or emergency conditions. They are pretty big for ordinary carry. But I tell you what, I keep them on a table by the door, and when I go out, it's a last minute decision, if I want to take one of them instead of whatever I happen to be carrying.
If you do like the CQD, consider the Mark II. It is a much smaller knife in mass and girth, but ... the blade is only 1/2" shorter and the handle is 1&1/2" shorter than the big one. And it's still a full-size workhorse.