I've wanted that khukuri too, and I know who owns it. It's a beauty, and I wish BirGorkha still made 20" sirupatis like that.
Look at it--scrolled buttcap, regular habaki sans cho creep, convex edge, and a proportional handle. That's what a sirupati should be.
Danny, I think you're out of luck. That khukuri is owned by the daughter of one of the original forumites, so I don't think it'll ever be offered up for sale.