How do I replace an OS in a multi-boot

[AWS]

I have a triple-boot PC (don't ask) with 7-Vista-7. When 8 is released, I will replace the Vista partition with 8. I don't need help with the install, as I know that I just follow the Custom Install route. My question regards the removal of the Vista partition. I could format that partition first, but will Windows become confused and think that Vista still exists somewhere? Or I could just install 8 with a Clean Install. Any suggestions? I really hate it when multi-boot systems remember an OS which is long gone. And if I want the boot order to be 7-8-7, will I need to edit boot.ini? (I ask this last question because it appears that the last OS installed is the top one in the boot list seen just after the BIOS screen)

 

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