I am currently in dusseldorf near the main train station what is the nearest fkk's and how can you get there by train. A taxi driver qouted me 90 euro to go to villa vertigo.

Calling Stephan is a start. I don't know about VV having a higher caliber of women over GT, that may be personal taste. From my experience GT will have more women. Living Room is closer, Dolce Vita is even closer. FKK clubs are all over the area not just in one direction from what I've found.

Golden Time Biggest
Villa Vertigo Most plush (more personal service from Stephan)
Living Room Smaller but lots of women and later hours
Dolce Vita more eastern staff but good value
Acapulco less expensive but harder to get to