buy a stainless steel 357 revolver either smith and wesson or ruger. choose the one that you like that meets that criteria.
the shotgun is a good buy and an added bonus, but if it is gonna be somewhere that you willnot have quick & easy access during sleeping hours, go with the revolver.
"Damn the torpedoes, full speed ahead!" -Admiral Farragut @ Battle of Mobile Bay 05AUG1864