I started out with a Fighter / Rogue, but later restarted with a high DEX+INT Fighter / Weapon Master (7) / Duelist, specialized in dual short swords, and had a ton of fun with her. Sadly I did not realise until it was too late that most of the Duelist abilities don't work when dual wielding.
Key feats were obviously all the Short Sword feats, Two-Weapon Fighting, Weapon Finesse, Evasion, Power Attack and (not to be underestimated) Weapon Expertise. But my absolute favorite was one awesome epic feat (forgot the name) that you can use every 6 seconds that seriously damages and cripples your target. Edit: it's called Expose Weakness
I always kept wearing Finch's Fine Chapeau (a hat from the OC, but there's a better version available quite early in MotB) simply because it looked way cool on the character.