Ok, I am looking for an overclocked 7970 or 770 for around £350 ±£20. I am hoping to avoid an Asus matrix 7970 (the one I got a while back showed severe artifacts after about half an hour of gaming) or the gigabyte windforce 7970 (a friend has one and it turns out that the voltages were locked and his wasn't stable at stock speed). I am hopping to use the card with a QNIX 1440p monitor with a DVI-D duel link cable.
So far I am interested in the Asus DirectCuII overclocked 770
Sapphire 7970 Vapor X GHz Edition. 4 free games compared to Nvidias 1, and there are many games where the 7970 still beats the 770. AMD released an article a few months back staying they will always be one step ahead of Nvidea. Take the 770 for example, a rebranded 680.
And I wouldn't go near any EVGA version except the Classified because of the historically weak weak VRMs. I had a factory OC'd FTW that would not run at advertised factory overclock ..... took 20 support calls, 18 months and 5 RMAs to resolve .... never did give me one that met the advertised speed, but replaced it with stock next generation card after 20 months of hassling.
Asus DCII, Gigabyte Windforce or MSI PE would be my choice