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You could check the various Reddit builds
https://www.reddit.com/r/PCMasterRace/wiki/builds#wiki_the_next-gen_exterminator
Granted those are US prices, but it shouldn't be very expensive in the UK (it's 505 quid at direct translation)
Basically, changes the graphics card for an MSI R9 370 ... it's a bit more expensive (50quid) but destroys the one you picked and will be good for another couple of years.
Bearing in mind with the budget that I have, do you guys thinks it's not a bad start for a PC?