Prices are totally wrong for Aria on PCPartPicker. Lower than they should be. Made some changes based on this, and another site that will save you a ton of money.

Changes -

• Replaced 4670k for 4690k as it's cheaper and better.
• Replaced Mobo with Z97. Although the motherboard you have is technically overclockable, a Z97 is designed to allow overclocking.
• 1866MHz RAM with lower latency. Due to timings the 1866 will operate essentially as fast as the 2400 RAM.
• The BX100 is better than the MX100 - see; and the 840 Evo - see. It's also the best value 120-256GB SSD.
• Much better GPU. You could also go for this 290, but it seems to have BIOS issues. The PowerColor card performs better though.

Last, and most important. Use Flubit. They source from Amazon/Ebuyer, and reduce any price. You'll save around 10% off every part. This build will be below £800 if you use Flubit. Research them if you are at all unsure. I recommend them to every UK build.

PCPartPicker part list / Price breakdown by merchant