^ That's one thing in this thread I agree with. The 6300 is pretty good.
With that said, the 6200 at stock will bottleneck the 680 a decent amount in games that aren't extremely GPU bound (BF3 SP, for example). It may be a fast BD chip, but it's still just a BD chip.
Get the 6300 and OC it a bit and you'll be doing good.