Best Graphic Card for £180 or $280

Hi guys, building a gaming computer and am looking to get the best bang for my buck, any help is much appreciated!
 

Topic moved to GPU section!

anyway: http://www.overclockers.co.uk/showproduct.php?prodid=GX-166-PC&campaign=affiliate/tag

£180 is either a GTX 760 or an R9-280X, the 280X is the more powerful card but I'd spend the extra and go with the recommendation above.

 If you want to get R9-280X performance levels for less money dabs have a used 7970 card with 6 months warranty for < £125:

http://www.dabs.com/products/gigabyte-amd-radeon-7970-hd-1ghz-3gb-pci-express-3-0-hdmi-windforce-3x-7ZWZ.html?us=1&src=3#usedstock

It's worth keeping an eye on their used section, sometimes there are some really good bargains in there.