Rapier

Source: Pathfinder d20pfsrd.com

Benefit: You can use the Weapon Finesse feat to apply your Dexterity modifier instead of your Strength modifier to attack rolls with a rapier sized for you, even though it isn’t a light weapon.

Drawback: You can’t wield a rapier in two hands in order to apply 1-1/2 times your Strength bonus to damage.

Weapon Feature(s): finesse

One-Handed Melee Weapons (Martial)
Martial Weapons	Cost	Damage (S)	Damage (M)	Critical	Range Increment	Weight	Type	Special
Rapier	20 gp	1d4	1d6	18-20/×2	–	2 lb	Piercing	–

Source: Core Rulebook