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#11
You can wait to order those recovery disks until you need to reinstall Vista, which you will never have to do if.....
After you get Win7 installed and running to your satisfaction, you'll never need to reinstall either OS again if you use the Win7 Backup Imaging utlity to make an image of your HDD which can easily be reimaged.
I make a primary formatted partition on each of my machines to store the image for easy detection if reimaging is needed, but it is best to store a copy externally in case of HDD failure. You just boot from the installer's Repair console, Recover Using Image and reimage your HDD or a replacement in 15 minutes.