I followed Starfield's awesome instructions over the weekend. I am now running Windows 8.1 and the VS700 seems to be working great!
I really wish that I could say the same about SONAR X3b though. I've found some nasty bugs involving the right-click popup menus and custom plugin menus. The integrated Melodyne feature has simply vanished from the menu as well.
Amazingly, the X3 program seems to be rock solid otherwise. I've ran it two days straight and not a single crash, which is pretty much unprecedented.
 
-e.B