To start with that's one fine pistol you've got yourself there. I keep mine in a plastic hard-case with foam liner and to be honest I've not seen any rust or deteariation on the pistol, being mainly exposed plastic (OK, polymer stuff).
I would recommend buying from our sponsors, without them we could not do this.
Oh, one other thing.. it should not be left in the case for long periods, take it out every day and practice, practice, practice.
Good luck, Phil