The Van der Nat fountains had a very good reputation but they stopped their production quite a few years ago (the factory is closed because they could not meet environmental legislation). The Van der Nat Fountains came in different sizes of which the biggest gave a 20 meters high silver wall. Weco still had/has some old production fountains in stock but I wouldn't recommend them to you. I had a relatively small (still 8 meter) Van der nat/Weco fountain but it unfortunately was a lemon (refused to go off). I heard similar experiences of people who had the bigger versions as well. I would recommend you to stay away from them since they don't give any value for money.
As to other fountains, I heard that the Zink Schweizer Super Vulkan I and II, as well as the Zink Verwandlungsvulkan offer good value for money. I can imagine that the same goes for the Weco Feuerblutenvulkan and the Super Effekt Vulkan (both produced in Switzerland).
Just my 2c
