A better permanent work-around I'm testing now:

Create a Symbolic link just to the Update Folder.
I moved the "Update" folder to my C:\, left my WoW folder on my SSD (Z:\)
My WoW folder is roughly 20gig instead of 35gig

http://en.wikipedia.org/wiki/NTFS_symbolic_link

cmd I ran after moving the folder:
mklink /d "Z:\World of Warfcraft\Updates" "C:\Games\Warcraft Files\Updates"