I got a Asus GeForce GTX 670 DirectCU II myself and I'm very happy with it. I see no reason in why you should by a 680 instead beacuse there isn't such a big difference performance wise. But the GTX 680 is costing quite a bit more.
I also got the same motherboard as Budwise, great board!
The new Bioschock looks interesting, been in deveopment for five years apparently. Haven't played a Bioschock game before and it looks like this will be the first one.