250 pounds for a 6-month used 770 sounds awful expensive, but then maybe prices in your area are really high? /shrug
As far 770 vs 780, the 780 can be 15-24% faster at the limit, which could make the difference between playable and not in some cases, but could also mean going from 18 to 22fps which doesn't really benefit you. At playable frame rates I think you'll find the performance difference smaller, but the 770 is definitely the better value per pound.
The AMD R9 280X will give you similar performance to a 770, while being a fair bit cheaper. Active displayport adapters have dropped in price significantly, but buying them erodes much of the price savings. The 770, iirc, has 2 DVI outputs, 1 displayport, and 1 hdmi.
For what it's worth, I'm running a 670 right now at 6032x1080 (5760 + bezels) and I'm able to play Borderlands 2, Mass Effect 3, Dark Souls, Bulletstorm, and Spec Ops with most everything set to high and FXAA. The 770 is a fair bit faster than a 670, and I'm pushing 900K more pixels, so I personally feel that you'll be well served by a 770, and the money you save compared to buying a 780 would let you buy an 870 or 970 a couple years down the road.
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