FENCING!
For a while I was a member of a gym that had a fencing team, and I can tell you that fencing was the most fun I've ever had with my clothes on. You get to whack somebody with a piece of ****l and not get yelled at, it's like every five year old boys dream come true.
As far as hand to hand weapons arts go, fencing is like boxing/wrestling/bjj in the sense of having evolved through a rich tradition of full contact competition. I'd expect that the other weapons arts are more like aikido/karate/northern-praying-mantis-drunken-style in the sense of being only hypothetically bad-ass.
That said, you might want to read what
this guy has to say about training in knife fighting.