Don't get a Caviar Green, too slow. Caviar Blue instead
http://www.amazon.co.uk/dp/B0088PUEPK/
Swap the RAM to this
http://www.amazon.co.uk/dp/B006YG94Y2/
Get PowerLine adapters instead of WiFi
http://www.amazon.co.uk/dp/B004INVKP4/
That PSU is pretty average, change it to this
http://www.dabs.com/products/xfx-45...4_1373636334_2c1f58cdf22ea1e710e1b792a851e6e3 Maplin do them too for £35 if your local has stock
That is a great mobo, stick with it. I wouldn't have recommended it in the other thread otherwise

Stick with the i5 too, the i3 is starting to be stretched a bit. I'd recommend a better GPU too, 650 is pretty poor. Either go for a 7850 (with 2 free games)
http://www.ebuyer.com/390921-sapphi...-displayport-pci-e-graphics-card-11200-14-20g or a 650 Ti Boost
http://www.scan.co.uk/products/2gb-...8mhz-gddr5-gpu-1032mhz-cores-768-dport-dl-dvi I'd go with the 7850 myself.
I know this pushes your budget up but if you're going to do it you might as well do it right. You can save money on W7 here too
http://www.amazon.co.uk/dp/B004Q0PT3I/
Here's the build I did for you in the other thread slightly tweaked. Took out the SSD and added a copy of Windows
PCPartPicker part list /
Price breakdown by merchant /
Benchmarks
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor (£172.50 @ Amazon UK)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£24.99 @ Amazon UK)
Motherboard: MSI Z77A-GD55 ATX LGA1155 Motherboard (£101.88 @ Amazon UK)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (£50.39 @ Amazon UK)
Case: Corsair 200R ATX Mid Tower Case (£47.98 @ Amazon UK)
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£51.87 @ Dabs)
Other: Sapphire HD 7850 OC Edition 2GB Dual DVI HDMI DisplayPort PCI-E Graphics Card With FREE Never Settle Reloaded download coupon (£136.98)
Other: Crucial BLS2CP4G3D1609DS1S00CEU Sport 8GB Kit (4GBx2), Ballistix 240-pin DIMM, DDR3 PC3-12800 Memory Module (£47.25)
Other: Microsoft Windows 7 Home Premium with Service Pack 1, 64-bit, English, 1 Pack, DSP OEI (PC) (This OEM software is intended for system builders only) (£53.89)
Total: £687.73
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-07-12 14:48 BST+0100)