First knife that came to mind was the Adamas, since I now own one and love the sucker. This is, it's not much of a slicer, with a thick blade it doesn't slice as much as split soft material. It will take more of a beating than any other knife I've owned, but if you wanna do delicate slicing (i.e. fruit/meat) it won't perform as well as most others.
Most ZTs will take a beating beyond that of almost any other company, I own a little 566 and I'm not afraid to do almost anything to it. For your size and general idea the 300 might be what you're looking for, but a it is a recurve so field sharpening would have to be done with rods rather than stones. The 560 series are fantastic folders as well, but they are on the big side for EDC.
I enjoy using the Adamas over the ZT, the Axis lock makes closing it a breeze and the blade just flies out with authority with the slightest of nudges or a flick of the wrist. If you are just wanting to slice tough material and aren't looking for a fine slicer, I'd go with the Adamas. (I've had a Contego, the Adamas just feels like a more powerful knife and has more control over the blade due to the thicker handle and shorter blade)