According to the guys at KLM Jets Centre a weekend in a Cherokee at Amsterdam will cost you about 180 Euros plus tax. You have to book a slot on +31 204059730 and handling with KLM is on +31 206488178
I have flown light GA into Schipol many times and the service has always been first class. GA even has it's own dedicated runways and terminal building.
It never ceases to amaze me that people will suggest alternatives to the main airport as a way of saving money yet when you actually sum it up it will cost you more to get into the city from places like Rotterdam, Hilversum, Lelystad etc. Fro Schiphol to Central station is a single train 20 mins from the station located under the airport. Once in town the world is your Oyster, the nuber 1&2 trams will take you down through Dam Square and onto the Leidzeplein and the Vondel park all within an hour of landing. I lived in Amsterdam for 5 years and still return regularly to visit friends.