alot simpler to get stuff shipped within the uk and cost less.
PCPartPicker part list: http://pcpartpicker.com/uk/p/tM1p
Price breakdown by merchant: http://pcpartpicker.com/uk/p/tM1p/by_merchant/
Video Card: EVGA GeForce GTX 660 Ti 2GB Video Card (£223.99 @ Scan.co.uk)
Power Supply: XFX ProSeries 850W 80 PLUS Silver Certified ATX12V / EPS12V Power Supply (£104.83 @ Amazon UK)
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-23 16:55 GMT+0000)
850 watt 80+ silver xfx fully modular powersupply made by seasonic one of the best ps makers.
and a nice gtx 660 ti for 223pounds
all within ur budget mate
u will be kicking monsters and taking names