That's it. I'm sick of all this "Masterwork Bastard Sword" bullshit that's going on in the d20 system right now. Khopesh's deserve much better than that. Much, much better than that.
I should know what I'm talking about. I myself commissioned a genuine khopesh in Egypt for 500,000 Egyptian pounds (that's about $20,000) and have been practicing with it for almost 2 years now. I can even cut slabs of solid steel with my khopesh.
Egyptian smiths spend years working on a single khopesh and fold it up to a million times to produce the finest blades known to mankind.
Khopesh's are thrice as sharp as European swords and thrice as hard for that matter too. Anything a longsword can cut through, a khopesh can cut through better. I'm pretty sure a khopesh could easily bisect a knight wearing full plate with a simple vertical slash.
Ever wonder why medieval Europe never bothered conquering Egypt? That's right, they were too scared to fight the disciplined Egyptian warriors and their khopeshes of destruction. Even in World War II, American soldiers targeted the men with the khopeshes first because their killing power was feared and respected.
So what am I saying? Khopeshes are simply the best sword that the world has ever seen, and thus, require better stats in the d20 system. Here is the stat block I propose for Khopeshes:
(One-Handed Exotic Weapon) 1d12 Damage 19-20 x4 Crit +2 to hit and damage Counts as Masterwork
(Two-Handed Exotic Weapon) 2d10 Damage 17-20 x4 Crit +5 to hit and damage Counts as Masterwork