The Boker Optima is a versatile hunting and outdoors knife that features interchangeable blades. It's been around for years, but is now available in a budget-friendly version with G-10 handles and AUS-8 stainless steel blades.
This set comes complete with an interchangeable saw blade, gut hook, and premium belt sheath (the extra blades and belt sheath are not compatible with the Boker Optima Series).