Here's a custom you might consider, thats cheaper than some of the production knives you've posted so far. There are some khukuri style knives as well but they are much longer and wouldnt carry as nicely.
http://www.mineralmountain.com/shortchop.htm
I've never handled this guys work in person but he has been around awhile and I remember him having a good reputation back when I was big into knives.