The Spec ops sheaths are definitly a step up in design from the yard sheaths.
I especially like the slit loop. It is such a clever idea I am surprised it took so long to think of it. One thing i do like about the Yards cordura sheaths is they are fitted to the knives. The one that came with my SH-E is the perfect size.
For a knife as nice as an ASH I would recommend a custom leather sheath like the one Rainwalker made for my DFLE. You can get away with cordura on a CG model but for an LE it should be leather. <img src="/ubbthreads/images/graemlins/thumbup.gif" alt="" />