USB, or a turntable with integrated AUX pre-amp to soundcard.
http://www.argos.co.uk/static/Produc...er/5124998.htm - a lot cheaper than the USB way, uses the existing soundcard/onboard.
One warning I'l give for this model, it has preset speeds and practically useless adjusters, so if it ain't right, send it straight back - also listen carefully for speed variations, a friend had to get one replaced because of that.