Fantastic article! I have been looking for a set of markers with a wide colour range and had not come across the Neuland set (I’m based in Sweden, Gothenburg). I will definitely be ordering a pack to try out. There is a great chapter in a book called The Facilitators Handbook that deals with Whiteboard techniques.
Also, I have found a cheap set of liquid chalk-based pens with a great set of vibrant neon colours sold through Biltema in Sweden: http://www.biltema.se/sv/Kontor---Teknik/Kontor/Pennor/Whiteboardpenna-7-st-2000036633/
As these are chalk based they need a wet cloth to be erased, but for certain situations they give an excellent colour range.