neon mouse

hi there i want a desktop ive already got monitor keyboard mouse etc just need a tower. thats not highend specs shows what i know about computers eh?

i need something for higher end gaming ive got around £600 to spend. i need one that has higher than the following. - Microsoft Windows 2000/XP/Vista/7 - 1.0 Ghz Pentium 3/4 or AMD Athlon/64 compatible processor - 256MB system memory (RAM) - 750MB free, uncompressed hard-disk space - ATI Radeon 9600/NVidia Geforce Ti4200 with at least 128MB memory - Microsoft DirectX 9.0c or higher - CD-ROM/DVD-ROM Drive for installation