A Mesh machine will be better built, have higher quality components and this price match at £500 offers better spec (especially the CPU) and a much better 1080p screen (would be awesomes for graphic work) from a good brand:http://www.meshcomputers.com/Default.as ... ign=panel1
You have no indication of what resolution the PC World machine's screen is (which is what actually matters) and in my experience Advent machines are disappointingly built and do not last long. I don't think I need to lambast that offering as Mesh clearly offer a better deal.
I'd upgrade the graphics card on that however much she can afford to improve the speed of 3D graphics apps and Photoshop CS4 (which is 3D accelerated now).
Rendering speeds in CAD programs will fly with a quad core CPU in compatible applications (i.e. professional ones).
NEVER shop at PC World. 99% of the time you can find a better deal elsewhere and even if you do wind up with one of their computers their customer service is a gigantuan rip-off. They're deliberately short of a decent range of stock and quality goods because they expect no-one to know what they are buying and their sales clerks are paid to sell you something that is not a good deal but has the best profit margins.
By the way apparently there are only 39 of those PCs left and it does look like a good machine and the mags approve as well.. you also get a free upgrade to Windows 7 which is far better than Vista, and more efficient.. so you will essentially get a free performance boost by upgrading to Windows 7; a faster booting system, less lag etc. I doubt "hot girl" would be disappointed.
This isn't Gaf where being a Junior Member means you're opinion is worth strawberry float all, this is GRCade where nobody has a decent opinion.
PM is your friend.