Sigh, if I had the money I would like to display some historically significant weapons:
A claymore sword- a real one not the faux cheap ones - family history says we were irish churchmen and mercenaries - kind of similar occupations at the time.
A Revolutionary Era flintlock musket - Brown Bess or French Charleville - a nice working repo
A Colt 1860 Army Revolver - working repo would be okay
or a
A Remington New Model Army - again repo okay
An English Longbow - with Arrows
And finally maybe a Nice Colt Peacemaker.
First I would enjoy looking at them, second they would remind me of their role in history, third they would conversation pieces, four they would not provide any criminal with a readily useable weapon, (unless they are adept at using a bow or claymore in close quarters or unless they carry black powder, caps, and or 45 LC ammo), and lastly because I think it would be oh so tasteful and I could occasionally take them down and shoot or swing them for fun.