The connection to the Amsterdam internet centre should be 2GB up/down.
Here are some Dutch fibre providers:
http://www.unet.nl/
http://www.ethernet.nl/
http://www.xmsnet.nl/
http://www.fryslanring.nl/
http://www.dcf.nl/
http://www.introweb.nl/producten/cat.../fiber_access/
Costs vary depending upon if there is a existent connection or not. If there is, then costs are reasonable.