GPU upgrade quidance

Hi guys

I am looking to upgrade my gpu. I have a GTX580 now and its beginning to loose its power.. I have a few choices to select from. Any suggestions? Thanks in advance!

P.S. I game at 1080p on a single monitor.

http://www.scan.co.uk/products/4gb-evga-gtx-770-classified-acx-28nm-pcie-30-7010mhz-gddr5-gpu-1150mhz-boost-1202mhz-cores-1536-dpor

http://www.scan.co.uk/products/3gb-asus-radeon-r9-280x-matrix-platinum-6400mhz-gddr5-gpu-1100mhz-2048-cores-dvi-d-hdmi-dport#

I am also thinking for the 290x but for now it is quite off my budget.
 


Is it better than this one?

http://www.scan.co.uk/products/3gb-asus-radeon-r9-280x-matrix-platinum-6400mhz-gddr5-gpu-1100mhz-2048-cores-dvi-d-hdmi-dport#
 
Yes it's probably the fastest 280X out of the box. But it's also quite tall (2.2 slots) and long (308mm) so you'd want to make sure you got that much space in the case. It will also obstruct the expansion slot directly beneath it because the cooler is raised.

For it's performance you really don't need a second card. So I'd recommend it since its faster and cheaper.
 



I couldn't find any pieces in stock though. And I hate the orange colour ;/ I really want to stick with black and red in my case, but I think it is possible to repaint the orange part