Hello,
Apple offers a really nicely priced "family license" that allows 5 computers to share the operating system software. You might wish to consider that in your options. And dual booting is setup either in the Startup Disk control panel, or if you are more techy and added something like YellowDogLinux, you can actually have an Open-firmware based boot menu when the machine first turns on.
Nearly every normal user stays with the Startup Disk control panel.
Christian
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