That's £60 more. I have a budget, I can't go over it. Thanks for the help but I can't increase my budget anymore. I'm already pushing it as it is. I was undecided on the PSU, it has decent reviews on Ebuyer and the specs are spot on but I'm not 100% on the brand. After using a modular PSU before though, it would be a pain to go back to a standard PSU.
Buy the RAM you posted, that will save ~£10. Get 25 posts at hexus forums for free delivery at scan, or scout for the parts on Amazon, im sure itll only be maybe £30 more once youve found the cheapest place for the parts.
Also remember that SSD will be £58 at Aria as they have a £8 delivery fee. So even before looking for cheaper sites youve got a £50 extra cost for a much more superior system, which also can be upgraded to an i7 4770 down the line or even one of the haswell refresh chips.
Whatever you do, dont get that PSU.
Edit ive got it to £341 using Amazon (CPU, Mobo, RAM, PSU) and eBuyer (Case, SSD). Only £30 more than original build.
i5 4440
Gigabyte GA-H81M-D2V Motherboard
Kingston 8GB Beast Ram 1600Mhz CL9
Corsair Builder Series CX 430 Watt - Yes its enough for your config
Fractal Design Core 1000
Crucial 120GB M500 SSD