Building a PC

Can someone help me build a PC

I am looking for something with a window case, or a totally Perspex case
3ghz+ or Equivilent
1gb + memory
AMD/Intel - Am open for suggestions
ATI/Nvidia, Same again, open for suggestions
120gb or there abouts REMOVABLE harddrive, ie one thats in a floppy disk sorta bay


I would like it to have some sort of color inside, ie Lights/Fans with LED's

I have a budget of £500 but can push to 600

ALL I NEED IS THE MAIN UNIT AND POWER SUPPLY, I DON'T NEED OPERATING SYSTEM, MONITOR, KEYBOARD, MOUSE etc

Please can you guys help, i need it to be able to handle most games, ie BF2, CSS, HL2 etc i also wish to use it for Movie viewing and graphics work, so i want it to be a system that will cope with whatever is thrown at it

Hope you guys can help

Scoooooooterking