I'm sure there were a few similar to that but slightly cheaper too, unless they've all gone.
I do believe with that GPU or the ATI equivalent, it'll be your best option. Simply put, because they're considered second stock or stock that can't be sold through the standard channels, they'll sometimes take a huge hit of the standard margin off.
In laptops it's very hard to get a decent GPU, especially in the UK, at a decent price, so I sincerely believe something like the above will probably be the best you're going to find.
Other machines might have better parts elsewhere, but the GPU is what matters for a gaming machine if you don't want to feel held back by it.
Oh and as a small, FYI, remember they [laptops] with better GPUs only run at full speed on mains power; they usually downclock when on battery as the power demand is too high.