Bear threads are always interesting, up to a point, but I take it your question is not "which handgun is best for brown bears" but more like a request for ideas on whether one of your .40 S&Ws should be converted into something stouter. Yes.
I can see adding a large-bore revolver -- the Rugers are probably the best value for the money. Many folks in Alaska keep such a gun around, in belt or shoulder holsters, or in the truck.
A 9mm or .40 S&W pistol -- something concealable -- is still a good weapon to own for everyday carry, particularly in suburban areas.
But if you intend to spend a lot of time fishing, camping, hiking, etc., a 12 gauge pump or a .45-70 Henry or Marlin lever action rifle would provide an order of magnitude better protection -- at a reasonable cost. I'd sell one or two of the other pistols to get one.