That's far, far, far better than the 2 cards you listed. They don't even make those cards anymore, mate!
Very decent PC that, the processor is 2 years old but it was very high end when it was released and it's still very good value and it'll be as good as or better than anything you'd find in any laptop sub £1250!
Check these benchmarks for the graphics card and the laptop:
GPU: http://benchmarkreviews.com/index.php?option=com_content&task=view&id=416&Itemid=72
CPU: http://www.cpubenchmark.net/cpu_lookup.php?cpu=Intel+Core2+Quad+Q8400+%40+2.66GHz
Pretty good value that PC, from where I'm standing anyway. But with currency conversions/the fact I pay 35%+ more for parts in Ireland, you might get a better opinion on price from Avinalaff. But it'll certainly play nearly every game on the market at good settings at playable framerates.
More than sufficient for a casual gamer.