Ive seen 'this' (if it is only 1 laptop) for £349 with different specs from the Dell site, im enclined to think that Dell site would be right and that the other site has made a muck up. Im tempted to order the laptop and see what arrives...
I cant see how Dell could make a totally different laptop and only change one letter in the name, im sure they wouldnt be that stupid because of all the complaints that would undoubtally arise.