A 6850 is fine for most of today's games. I can run BF3 just fine at 1080p High settings with my 6870 (only slightly better)
You NEED to not listen to this guy.
I didn't say it wouldn't run his games, I said a better card would run them better...
I haven't sold a 6 series card in my shops for at least a year, to a gamer...
All the best Brett