OK, first off, you should check out Larry Harley's site,
Lonesome Pine Knives . He does use dogs for his boar & blade hunts, but I think you should pay attention to the features of his hog knives. Note the good point, broad blade, sharpened or well ground false edge on the spine & clip. If you plan to stab with it, (and you should) then forget any knife with a rounded point. The blade shape must present the
point to the target, rather than the
edge .
There is another whole segment of the blade market that you guys have ignored once again. Many reputable sword makers also offer short swords and great big knives that would fill your requirements perfectly, including the price cap. Check out
Lutel's home page for instance. (click the "catalog" link, than click on "knives" or "daggers" or even swords) Several of these designs are much better for your purposes than half the suggestions you've gotten so far, and from all reports they offer good quality for the price.
All Saints Blades has several daggers and even short swords made by the highly respected Mr. Angus Trim. Or check out the offerings from Del Tin, such as their
Cinquedea . Do some searching.
Another idea, since you don't use dogs- how about a bayonet on the end of your gun?