There is a handful in Dusseldorf:
Magnum, Oceans, Acapulco Gold, Dolce Vita and very nearby Livingroom. Pretty much all of them are on the outskirts of the city (or in places like Kaarst and Ratingen), but reachable through public transport.
Magnum and Oceans only start getting interesting late at night, so take that into consideration.
Acapulco Gold and Livingroom have a decent line up in the afternoon and evening, but get slower towards midnight.
Depending on the day you go, all clubs should have 50+ girls working (except acapulco gold, which maxes out around 40).
Pricing is similar everywhere (might be some specials) around 60 for entry and 50 for each 30 minutes. Again Acapulco is different in charging 20 or 30 entry and 40 for 30 minutes.
I would recommend Livingroom in Kaarst (S28 from dusseldorf to the stop Ikea Kaarst and then a short walk). Pretty girls and quite a few with good service. Also the only club on this list that offers free beer.