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i would spend the extra £15-£20 like i am and get the r9 270
http://www.overclockers.co.uk/showproduct.php?prodid=GX-339-SP&groupid=701&catid=56
This would be what I'd pick - except it takes 2x6 pin connectors and I think the OP is saying they only have one so a 265 although worse value for money might be the best pick.
If you have to stick to a single 6 pin then a 750ti gets my vote.
I take it back, a 270 with a single 6 pin can be had Asus does one, it's on the rainforest for £120 or OCUK does an MSI for £130
Shame OCUK don't seem to have a single 6-pin option at that price point.
I take it back, a 270 with a single 6 pin can be had Asus does one, it's on amazon for £120 or OCUK does an MSI for £130
Any particular reason why?
Overclocks like a boss, nice and low power draw and has PhysX and stuff.