Fighting with one handed weapon & no shield

[Kae'Yoss]

If you want to play someone with just one weapon, and don't mind it being an elf with a long sword, go for bladesinger, the elven warrior-poet-mages. They only use the longsword in one hand (and nothing in the other) and only light (or no) armor, and get cool stuff, starting with your INT bonus to your AC.
All in all, it's a powerful PrC, and still one with great RP opportunities.