Is there a Points / Rewards plugin here that I'm missing?

Looking at options for rewarding users for things like sharing on social sites... thinking I'll probably go with PunchTab or Cubepoints, unless there is one on here that I'm missing... in which case I'd like to try it before deciding.

If there isn't, any pointers on rewards plugins would be welcome. Specifically want to focus on rewarding users for inviting and sharing... even more specifically, not just for sharing, but giving extra points each time the link is actually clicked on by a unique IP.