I would stick with the Redhawk. Remember you are not going hunting with it, you are carrying it for defense.
As far as long guns, one piece of conventional wisdom up here is, "If you can't kill it with a 30-06, you should hide."
Having said that .338s and up are quite popular. You can have my Marlin 1895GG in 45-70 when you pry my cold dead fingers... 12ga with slugs also a terrific option.