I would recommend you pay a visit to XX Knifes in Marietta. Owner Davidnis the most knowledgeable on Case I've ever seen. He might even buy the collection for his shop.
My favorite boot knife is the Cold Steel Kobun. Lightweight and quick in the hand. Nutnfancy has a video on it if you want to see a review. Sheath is zip tied to the inside of the boot straps on my Durango's.