What to get...

How about a forged battle ready katana you can actually use? http://www.samurai-sword-shop.com/hanwei-paul-chen-samurai-swords-110-ctg.htm Note: (Never used this particularly site, just an example of several sites selling these swords.)

Ninja katanas aint really a thing. A ninja wouldn't carry something that big and with that giant hand guard. Go for 2Samurai style katanas!!

I think they misuse the word "Ninja" for a sword.Also I believe the "Ninja" katana are the shorter swords know as Ninjatos. Also vampire Neko,As soon after I move to my new place....I will buy a battle ready blade....Wonder if they sell samurai armor on the internet.

If you really have your heart set on Japanese weaponry as decor you really can't go wrong getting a bunch of shuriken and chucking them at your walls.