I like swords, both the use of them and the artistry that goes into making them, so I certainly wouldn't say no to a katana.
That being said, I would have no idea how to use it. I'm a pretty good epee fencer, and as such I'd prefer a sword designed for stabbing. A rapier would be quite nice, but given the choice I'd go for a jian. They're Chinese straight swords which are designed principally for stabbing; however, they're slightly smaller than rapiers, so they're less cumbersome, and can realistically be used for cutting as well. On top of all this, a well-made one is just beautiful to look at.