That's more or less what I was looking for a sheath and a good knife that fits molle.
Plenty of good knives come with a good sheath. Like the Kabar. You can purchase one with a traditional leather belt sheath, or a hard plastic sheath that can be tied to molle. There are also plenty of aftermarket sheaths as well, like the Spec Ops. Lots of choices when it comes to knives and sheaths.