| Since you are already using OS 9.1, and even if you weren't using OS 9.1, you will be able to install OS X Final right on top of it. For me, it is much more convenient to have a second partition to install OS X on. That way, when I'm booted into 9.1, I don't have to look at all of the (normally hidden) files that OS X uses. I have my normal looking OS 9 Partition and my OS X partition. Also, you can avoid having to reinstall BOTH OSes if you go with a second partition. If OS X screws up and you need to reinstall it, you don't have to worry about not being able to access your OS 9 partition, and you can clean-install OS X.
My 2 cents...
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Zach
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