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Just build a new base system with the money you have for the gtx580 and get the big GFX card later
Well I managed to find a video review of the PC, and the PSU will fit in fine. Looks like the 580 will fit in too: http://img1.magnus.de/Test-Aldi-PC-...e-CPU-f577x346-ffffff-C-8e9e71d4-16626402.jpg
Well, XFX Cire Edition is slighly bigger than my current one, 170mm x 150mm x 86mm (L x W x H), but since i don't give a crap about my current case, nor the noise since i'm on headset, perhaps i could cut the case to fit it in?
set up a small bench area and keep your pc running without a case if it won't fit . It should fit in fine though....
What resolution screen are you using? Bear in mind under 1920x1200 a 580 would be wasted.