Maximus,
I went through this exercise last year with a 470 Westley. I also elected the 375 Flanged Magnum, while not as practical as the 9.3, nostalgia pushes our buttons.. Sometimes you really do need vote with your heart. I also went for a set of 20 bore shotgun barrels. The shoe lump pattern was already set up, so they were relatively cheap.
Good Luck!
JZ