Considering the linked page contains benchmarks, you don't exactly need to be able to read dutch it to understand it........
The benchmarks clearly show the 1900GT miles behind 7900GTO, I don't think we want to bring the GT into this.
Nuff said.
In response to whether the 7900GTO is any good. They are released as a one off set by OEM suppliers. I would imagine to shift some GTX cores with some slower memory. If the site you listed the benchmarks from is reputible, it is even better than I thought.
I bought one yesterday! As my old card broke. They seem to be the best buy at the moment in the high-midrange category. I'm not sure whether I would have bought one if I could have waited for DX10 cards though but I am rather excited about this puchase.
I will post again when I receive it. For UK users I bought the MSI 7900GTO 512Mb on Dabs for £165 (inc. p+p and VAT).