Question? How many NT Server CLIENT licenses do you have?
If you have 50 , then go into the License Manager, found through the Start -> Programs -> Admin Tools -> License Manager and look at the number of Licenses allocated for the PDC or Serverthat all the workstations will be accessing. Per Seat is the right choice I think, unless you only have say 10 Licenses, and want to have a first come first serve basis. Remember that you are only alowed one change, so if you change to per server and this is not really the right choice then you will be stuck. Good luck.
Smurfman