There is, I'll admit, one or two mods adding a khopesh to Oblivion, but frankly they're rather dull-looking, like lumps of hammered copper. Sure, they're mosre historically accurate, and as a History major I admire that, but compared to the begemmed weapons and glowing glass swords my opponents are weilding, they look a little plain and dull.
So, I would ask that someone make, to put it plainly, a dealy, pretty khopesh, something like these pictures:
http://www.odinblades.com/Gallery/gallerypics/Swords/Main/Khopesh/1.jpg
http://www.bronze-age-craft.com/images/budget_khopesh.jpg
http://www.mmoz.com/photopost/data/504/stygian_warrior_poster_small.jpg