Second hand gaming rig build challenge!

[rob4001]

Hi

I am trying to build a gaming rig from second hand components looking at £200-£250 budget. Suggestions please.

Thanks

[Iron Sights]

Is there anything you have already or do you need the full works

And also do you need: monitor, OS etc

[rob4001]

monitor not needed just the box.
OS is needed but xp or vista is acceptable.

[Pob255]

Going by current 2nd hand prices that's going to be very steep esp inc OS