I'd go with Rogue, and NOT put a high stats in Int. The rogue's high skill points compensate for the loss, and even moreso if you play a human. I'd go with:
Str 10
Con 12
Dex 13
Int 9
Wis 10
Cha 9
Max out your survival skills (Listen, Spot, Move Silently and Hide) and go for the archery route. Take the PHBII feats that add sneak attack damage to your critical hits and the one that lets you ready an action to shoot an enemy when your ally hits that enemy, which makes the enemy flat-footed (and sneak attackable). Boost Dex whenever you can. Get lots of skill points in Use Magic Device and carry a bundle of scrolls with Cat's Grace, Shield, Spider Climb and Cure Wounds.
Describe yourself as THE everyman, easily forgettable and overlooked.