I bought a new 500gb drive for my install (wanted one anyway.)
After initializing and formatting the new drive in vista I swapped SATA cables to make new drive my primary... and left vista drive unplugged for now (didn't want to risk anything touching it during install.) I ran my Win7 disc (upgrade disc) and everything went through fine. If you have trouble with your legitimate upgrade on clean install, these tips should get you through it pretty easy: http://www.winsupersite.com …install_upgrade_media.asp
Then I shut down, reconnected my Vista drive as secondary, and restarted my machine. In a month or so, once I'm happy I've got everything I need restored from my external backup (documents, pictures, itunes library, etc) and sure everythings working properly, I'll format my Vista drive and recover all that space.
edit: I did went from 32 to 64bit
Thanks for the tip David. To be on the safe side, this would definitely be a good option in case something screwed up during the install. Appreciate the input.
This was a darn pita. I sure hope this doesn't happen anymore when 7 is installed. 


