What do I need to get?

[Abokasee]

What do need to have all these things below? (or better)

SYSTEM REQUIREMENTS

MINIMUM SYSTEM REQUIREMENTS:
Microsoft® Windows® XP Service Pack 2, Vista
1.8 GHz processor
512 MB RAM
8 GB available hard drive space
128 MB video RAM or greater, with DirectX 9 Vertex Shader / Pixel Shader 2.0 support (Nvidia 6x00 or better)
Sound card, speakers or headphones
Broadband internet connection (DSL/Cable).

Clever people might have spotted this is the minium system requirements SupremeCommander, so if you can tell me were I can get it, how much will it cost, and are there stuff better than this which is slightly more expensive or cheaper.

*EDIT
Please give the answer in £ pounds one $Dollor is about 50p, 2 50p's make a £1 for those who dont know