answers that question been a long week lol. http://www.scan.co.uk/products/edimax-ew-7612pin-v2-pci-e-(x1)-300mbps-wireless-adaptor this would work fine for the record.
Talk some sense into your mate. If he's prepared to drop £400 for a single game, why not invest a bit more to give him more future versatility. Once he's got the pc and is using it he's inevitably going to find other games he wants to play etc. and will kick himself for not going a little higher spec from the outset.