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If you really need something now though, I'd get an R9 390 and pocket the other £100.
I would wait until the new cards are out, if you don't have a card get the 390, but really you need to wait as the £350 price range should be out in a month orso.
They're doing a new build with a 6600K. Easy to know if you take the five seconds it requires to read their other posts.It's a bit mean to recommend a 390 without knowing their CPU, PSU and OS. What if they have an old i3 or Phenom, a 400W PSU and are running SteamOS?