Not a whole lot, and if all you want is a machine with a solid warranty and on site for hardware failure, probably IBM or Dell. I've only ever had to call in Dell before, don't have any deals with the others, but their gear is just as solid as either of the others. However, if price is an issue, with the ridiculously low failure rates of hardware these days, its still cheaper to build your own.
Cheers,
Finegan
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