I got that list from overclockers.co.uk it comes to £482.19
I usually use scan as well, but i find it harder to navigate and the design is horrible.. i'll move over to scan when i know what i'm looking for and compare prices.
I generally don't use it to compare specific products, because I either know what I want, or ask people here if it's a brand vs brand thing.
Also, I just checked what it would cost to remake my PC there (using the closest equivalent GPU), and it came to £1100. I then made an as-similar-as-possible system at Scan for £850. You may have more wiggle-room than you think.
I managed to shave a few quid off using scan: £462.75
Although: I couldn't find the same or equivalent graphics card on scan so that price is the same and not sure if HDD will need changing, depending on what case i go for.
My finished spec
Silverstone Milo ML03B Micro ATX, Black, Slim/HTPC Case with USB3 w/o PSU
400W Silverstone Strider SST-ST40F-ES, 80% Eff', 80 PLUS, SLI/CrossFire, EPS 12V, Quiet Fan, ATX v2.3, PSU
MSI H87M-G43 H87 Micro-ATX Motherboard Socket 1150 Haswell
Intel Core i5 4440, S 1150, Haswell, Quad Core, 3.1GHz, 3.3GHz Turbo, 1100MHz GPU, 31x Ratio, Retail
Corsair Memory Vengeance Low Profile Jet Black 8GB DDR3 PC3-12800 CAS 11 Dual Channel Desktop
Sapphire HD 7750 1GB GDDR5 DVI Micro HDMI Mini DisplayPort PCI-E Low Profile Graphics Card
Seagate 1TB SATA 3 Performance Hard Drive OEM ST1000DM003
Total cost with cable management kit, bluetooth adapter and shipping: £528.64
Would have liked an aftermarket cooler but will see how it goes noise wise and will no doubt need to upgrade the GPU in a couple of months.
If you decide to get one I recommend the cooler master geminII
Extremely quiet and short with more than adequate ambient and cpu cooling.
1150 has the same mounting holes as 1155 and 1156, so it'll be fine.