Try Katanas, although you will find the range wanting, unless you go Washing Pole or a few others. The Bloodlust is also a really fun weapon, even if at max it doesn't do as much damage. It's really fun using the weapon skill and causing staggering effect to Knights.
Still, a maxed Hollow Black Blade, maxed Hollow Scythe and a
are my main weapons. It gives me a full range of attacks for different situations.
I still want to play around with the twinswords. The Gotthard Twinswords look really good, although I'm not sure if they are Dex or not. But I saw a video and they were outdamaging many other weapons in duels.