I've got a NATO from Corvus, which I think only came in a couple of variations- Standard NATO and RAF in grey and Bond colors.
It's a good, durable strap... Does it's job very well and looks good. But it's only a temporary means for the time being...
Also have some straps from WestCoastime... Good and cheap. Lots of colors available... And perhaps a bit softer than the Corvus strap. But I think the Corvus may be more true to a Military NATO... At least, that's what they advertised...