Video Card:Sapphire Radeon R9 290 4GB Video Card (£349.55 @ Scan.co.uk) Total: £349.55 (Prices include shipping, taxes, and discounts when available.) (Generated by PCPartPicker 2014-02-04 22:35 GMT+0000)
For £50 less you should expect better performance.
Thanks everyone. I really do love the toms hardware community everyone is so helpful and kind haha. Anyway back on topic I was actually considering a non reference r9 290 but the problem is I haven't really watched/read enough reviews yet on the new non reference cards and I want to build the system ASAP so I am happy spending the extra for the 780 because I know it's a smooth and refined card. I may give it a few weeks and see if some video reviews come through from youtube channels like newegg or tech of tommorow.