HI guys i've decided to upgrade my graphics card 8800gt 256mb which was bottleneck for skyrim high settings.
I've been wondering which card to buy they are both second hand going for R700-R800.
which one do you prefer should i get

my rig:
i3 550 3.2ghz 1156
gigabyt h55 s2h motherboard
4gig kingston ram 1666mhz
samsung lcd 17"( i'll upgrade to 20"-23" led soon)