Ehhh, screw the binned talk. I bought a EVGA GTX 670 reference and OC'ed it myself to 680 speeds easily using Precision X software. Solid as a rock! I've always thought, why pay extra to have the manufacture OC my card when I can do it myself. Just my 2 cents! On another note, if your not comfortable overclocking yourself, then pay the extra $20 and get the EVGA FTW.
If your curious and if this helps your decision making since they were talking about tempatures in previous responses, under load my card stays in the mid to upper 60's while OC'ed using the stock cooler. Depending on your cooling setup in your case and on your GPU, your temps can vary greatly. I play games like Battlefield 3, Diablo 3, and Skyrim on maxed settings...