I'm toying with the idea of building a .450 Marlin or a .458x2" on a short magnum Remington 700 I have laying around.

.450 Marlin

pros: - Cheaper dies (RCBS $56)
- probably cheaper and easier to find reamer and gauges
- brass available w/o modification

cons: - brass although available are not very common and are expensive
- availability of brass in the future

.458x2"

pros: - brass can be made from any magnum case
- cheap brass
- cool factor of a wildcat

cons: - expensive dies (RCBS $170)
- reamer and gauges probably not as easy to find
- brass needs to be modified

With both having the same ballistic I'm leaning towards the .450 Marlin despite the brass factor. Am I missing anything? Which one would you choose?