Although I would be quite annoyed if my Scaleo P played up in any way, has it not occured to you that the ATI X600 may not be a Fujitsu-Siemens fault, but an ATI fault? And on my Scaleo P, there is a 350w Power supply, which should be enough to run the ATI X600.
What makes you say the graphics card is kaput? Are you sure it's the graphics card and not something else? (Sorry if you know lots about computers and know about this stuff). It could be the drivers or, maybe you've moved something inside and the RAM is put in wrongly.
I think it's just a bit wrong to say "Think twice before you buy a Scaleo P", when you've just had one bad experience, when I'm sure you gets loads of problems with any other PC manufacturer, or even a local PC builder.
Sorry if that is stuff you already knew or thought about.