Network Printing Problems

I am a technition in charge of 7 public schools in our district. I have set up all of my printers to print from my windows 2003 server. All of my workstations are given printers via the ”
RUNDLL32 PRINTUI.DLL,PrintUIEntry /ga /c\\machine /n\\machine\printer /j”LanMan Print Services”
” command. This works great, except for the setting of the default printer. If I add two printers to a machine, sometime wiin2k seems to set the default based a alphabetical reference to the printer names other times it seems to make the last one added the default, and still other times it seems to make the first one added the default. I have tried the /y to set the default, but this only seems to work if applied localy to the machine, I need a way to say “these machines in this list will have this printer as their default.” Any ideas??????