The rope dart (or meteor hammer for the blunt version) is very nice, too. Lower base damage than the spiked chain but even better reach. Or there's the scorpion chain if you like the spiked chain but prefer slashing damage and a better crit range. All of those are 2-handed finesse weapons, as well.
The kusari-gama is great for a 1-handed finesse reach weapon, or the elven thinblade if you want bigger damage instead of reach.
Then there's the lynxpaw if you want a finesse double weapon.