Proper way to install 3 Oses?

[BionicRage]

Hey guys,

I'm currently trying to get 3 Oses runing on this spare 2.8ghz computer i have ( on 1 160gb eide hard drive). It's main purpose is to be a rendernode for maya. So i want linux (unbuntu) on there because it can run the system in prompt maximising the most resources of the machine. I need windows because of some of the other rendernodes for other programs that do no have a linux node yet, and i want to try mac so i want it on there also. I can use the arconis suite if needed. If any of you know how i can get this going, i'd greatly appreciate this. Also if i install xp and unbuntu first, can i later add os x?? again thanks for you help.