Erm, there are a couple of nice parties in Amsterdam on NYE! Of course, I don't know what your favourite dane music styles are. Anyway if you're into harder dance styles like hardstyle/hardcore/gabba then you should check out Qrimetime at Heiniken Music Hall. The whole dresscode idea as maffia is pretty cool and about 5000 people will be attending it:
http://events.q-dance.nl/2005-12_31-december_qrimetime/
If you like House you can check out Powerzone club. And if you like some variation, there is a NYE party at club Lexion, at Westzaan (thats a small town near Amsterdam, really close to where i live).
I'd be glad to help you out, but I will be celebrating New Year's in London this year (YAY all those great parties there make my mouth water already). But i'll be happy to help out to get the info you need!