My bro really wants a computer for Christmas but my mum is to skint to get him one so I was going to try and build him one with an old graphics card I have. Could someone please help me find the right components, he will most likely use the comp to play world of warcraft/minecraft

I wanted to build it around the graphics card I have - geforce 9500gt.

My budget is around £200 - £300

any help no matter how little is a big help because i've never built one before