oh no need for apologies.
Well i deducted your 680 from the list now 7970 and 680 ties and 670 becomes the most popular GPU by some distance.
I also upgraded to a 4GB 670 from a 2GB 670. I will be going for SLI in 2 months hopefully. How is the performance? Do you see any microstuttering?
Also i agree on surround tweaking. Most games out there usually require you to tweak something in surround it seems.