I bought this Lenovo on the weekend:
http://www.pcworld.co.uk/gbuk/lenovo...06307-pdt.html
8gb ram, dedicated graphics card, and 750gb hard drive. Seems to be a very good spec for the price. Lenovo own IBM (so I was told). It has a great brushed alluminium finish too. Mine is a deep browny / aubergine sort of colour, not gun metal.
Cant fault it so far.