Well, I went with the 6850 from my local shop just for the warranty really. Didnt fancy a used card, as ive been using used for years. It's nice having something new
Got the Asus OC version. Should do well.
Now just waiting for the game to arrive...ugh
Thanks for all the advice though guys. I got a good deal on the 6850 so if it doesn't do as I want in medium resolutions then i'll sell it on and save for something with more DDR onboard.