Good Gaming PC for BF3/Skyrim?

Can Anybody recommend a gaming PC to play BF3/Skyrim? Prebuilt preferred as I know nothing about building a computer.

Minimum requirements:

• Processor: Intel Core2Duo 2.4 GHz / AMD Athlon X2 2.7 GHz OR Better
• RAM: 2 GB
• Video/Graphics Card: nVidia GeForce 8800 GT / ATI Radeon HD 3870 OR Better
- Graphics Card must be DirectX 10 or 11 compatible
- Graphics Card must have a Minimum of 512 MB of RAM (graphics card memory)
• Processor: Quad-core from Intel OR AMD

Maximum requirements:

• RAM: 8 GB
• Video/Graphics Card: nVidia GeForce GTX 560 / ATI Radeon 6950
- Graphics Card that is DirectX 11 compatible
- Graphics Card that has a Minimum of 1 GB of RAM (graphics card memory)
• Sound Card: DirectX compatible


Up to £500-£700 is maximum budget.

Thanks