I am running 2 6800 GToc's from BFG. I am very pleased, but am sure that there are better ones out there. I have always been pleased with the GF cards, as every computer I build I place them in. Except for one because it had integrated video. That was a strictly web machine and rarely used for anything else.
If you want some scores to compare them with, let me know the program and I will try to get it and post my scores. Hope this helps a little. I tend to compare scores on several websites before I get my new cards, and never bother with the very top end as the money just does not seem to be worth it, Other than bragging rights that is.