I think the Ontario RAT5 or RAT 7 or RAT RD will please you greatly, and come in well under budget to leave room for a nicer sheath or stones. The RATs can really withstand usage that is closers to abusive as opposed to normal work. The steel used is very tough and easy to sharpen. Most most hard-use fixed blades, the steel and the heat treatment favors toughness over edge retention, so it will not hold an edge as long as most good folding knives because the steels used are generally different and they are treated to favor different aspects of performance. The larger RATs used 5160 steel, which is an even tougher steel than the already tough 1095. I am a big ESEE fan as well, although I think the RATs are easiest to find at budget pricing.
As noted, knives like the Ka Bar Fighting Knives are made more as weapons that for heavy utility. The design aspects reflect the differences in intent of usage. For a fixed blade that will see heavier utility work that is primarily NOT for defensive purposes, and especially if this fixed blade is going to see intense impact, a design that favors heavy utility is ideal IMO. To me, the RAT performs this role flawlessly.