I'll go with Knife Center exclusive Spyderco Manix 2 in CruWear! Not exactly "heavy duty", but it'll cut whatever you need cut and hold up to as much abuse as any ZT out there. Best ergonomics that I've handled so far, literally, the best. Tough, wear resistant blade in a classic platform. In my eyes it's pretty tough to beat.
You'd have to shop around for them since their run is over, but you should be able to find one around $200. You could even go for the diamond pattern G10 sprint run, but I'm partial to the carbon fiber, haha.