I would be dubious lookin at the performance posted on ebay as the guy uses an opteron aka a work horse processor. So that probably boosts the score hugely as the bench mark software used measures the system working on all fronts not just graphics.
Oh and by the way it is cheaper to buy from there as the postage is more reasonable and they are the UK's biggest computer equipment seller. So you cant really go wrong. Ebay is something I tend to avoid.