You have a long list of servers to shutdown/reboot. There is no budget and you are not exactly hot on installing free ware tools.
The built in command ‘shutdown’ is capable of performing a remote shutdown of computers. Used with the /i or -i switch , you will get a nice window to choose your options and specify a text file of servers you want to work on.
Great for pulling down all the web servers, followed by the database servers and so on.