Most of the khuks mentioned (other than UNcles suggestion) are moderate in price and in size. If you're over 6 foot tall and got some meat on ya, and are not adverse to carrying a few pounds of steel, go big. Like the 18" range. The AKs will be the heavier in this sie, but you'll find that the Sirupatis, kobras, and gelbu specials in this length can do good chopping work without being too heavy. You figure each blade comes with its own by-knife, so if you go big on the Khuk, you get a nice sized working knife as well.
Keith