Ok, I was able to answer the second part of my question by visiting this site...http://www.mydigitallife.info/clean-install-windows-7-with-upgrade-media-and-product-key-on-formatted-or-empty-blank-hard-drive/
and it looks like it will save me some time (though I hear that the install times on SSD Sata 3 drives are very quick)
I have done the double-install in Vista using the "clean install" followed by the "upgrade install" ontop of the clean-install to get it to activate.
On Windows 7, I did the registry hack manually as mentioned in your link.
It worked perfectly. I didn't want to have to install Vista on a new drive just to have to do a clean install of Windows 7. It worked fine.