Entry Level PC with High Upgradability

[AirstrikeKitten]

So I need an affordable build on the recommended system requirements for Crysis 3 that can easily be upgraded. This could also be a Pre-built, but I thought Home-built may be better. Monitor will be 20"
Thanks

 

[AirstrikeKitten]

Budget= £550
Monitor Resolution= 1080p or less

 

[AirstrikeKitten]

£155.84 CPU Intel i5 3570 Quad 3.4Ghz
£46.30 CPU Cooler Thermalright HR-02 Macho and Thermal Paste
£51.55 Motherboard Asus P8B75-M LE Micro ATX
£28.51 RAM Patriot Limited Ed 8GB (2 x 4GB) DDR3-1600
£67.24 Hard Drive Seagate Barracuda 2TB 7200RPM 3.5"
£142.99 Graphics Card Radeon HD 6950 2GB
£25.14 Case CiT Orion
£35.91 PSU Corsair Builder 430W ATX12
£29.99 SSD OCZ Vertex Plus 60GB SATA-300 2.5"
£583.47 Total Ebay could be cheaper

Is this any good?