Kopaonik ski resort (Serbia) - the best money/value ratio

Hello everyone, we are a group of friends planning a trip to Serbia for celebrating New Year and skiing in Balkan's most famous ski resort Kopaonik. We plan to spend 4 nights in Belgrade (with day trip to city of Novi Sad) and 5 nights on Kopaonik, skiing and having fun. We already have accommodation organized and a minivan for moving around ( and for transfers, transport between cities, day trips, visiting some natural hot springs or just buying beer in the shop ). We have few places available and we share expenses so anyone interested feel free to ask for more info if needed...and join our international cheerful company !