Hmmm....Dex weapons...
Well, there's always The Black Bow of Pharis, a godsend in PvE, but for PvP you might wanna go with Murakumo. The only drawback is the 28 or so strength needed to wield it. Rapiers are good, especially Ricards. It is soooo fast. And you can use it with your shield up. Speaking of that, spears are pretty handy as well. The falchion is another cookie cutter for dex builds, as it is fast and doenst use much stamina to attack. (You can attack about 16 times at maxed out stamina, with the ring of favor) The Bandit's Knife is pro, if you can parry like a boss, use it. Period. This thing will wreck 60 hp tank builds. (you can take off about 70% of their hp ona parry with hornets ring) The great scythe and lifehunt scythe are awesome for any build, especially dex since they get a B in scaling. The movepool is great on the scythes as well. Other than that, the claymore works at low levels, even with a dex build since you only need 16 strength. The katanas are cookie cutters for a reason, they are pretty OP in the dex world. But anything I mentioned above is great.