If you need a heavier blade profile than the stock Kabar, you could consider the Kabar fighter (wider blade), or the Kabar heavy bowie, which with a sharpened false edge and at almost 1/4" thick is equally a devastating defensive tool, and a better chopper.
I've had many Kabars in and out of the Marines, and have never seen one break, and for a strict fighter or combo knife of light weight, hard to do much better than the standard USMC kabar or next generation.
For heavier work my current project is lightly modifying a $39.95 1085 hi carbon 9" Kabar large heavy bowie which I've used my random orbital sander w/hi alumina pads to sharpen the false edge. Take my word for it, it is one fearsome and razor sharp piece of steel (extremely tough). The grind is excellent, and is razor sharp out of the box. And at 9" blade length and with a kraton G grip very capable of almost any task I can imagine.
I would post some pictures, but currently have no convenient place to host (anyone desiring a digital picture can PM me their email and I will send it to you).
The other day I was cleaning the blade with a little lighter fluid, and accidentally cut completely through the rag I was using an into my finger. It was thankfully a small cut that bled profusely and didn't want to stop, but one that was absolutely convincing that a serious cut with this knife would be a devastating event indeed.
The sharpened false edge makes this thing seemingly handle like a cross between a roman short sword, a pirates cutlass, but with an edge that resembles something the barber uses on your neck.
I can honestly recommend the Kraton G handles on these knives. They improve the grip dramatically and make any task much easier (the leather is slippery by comparison).
No doubt the Kabar sheath knives are excellent in every respect, especially price wise.