A very interesting read, indeed... 
Personally, at the current stage of things (for example, no Apple Boot Camp support for external drives, etc. etc.), I would probably choose one of the blue Hyper-X 3.0 USB flash drives, which have very good specs and "reasonable" prices:
http://www.kingston.com/us/usb/personal_business#dthx30
BTW, I tried to create a Windows To Go drive (with a traditional external USB 3.0 HD) from within a Fusion Windows 8 Enterprise VM, and all went well: but then it didn't work "natively" on two of my Macs (it booted with the 8 logo, configured something, but then only a black screen...), so this still seems to be rather unsupported.
The Hyper-X Keys also have a great look from the design point of view...
The only problem might be total endurance, as they probably are designed as data drives, rather than OS drives (but with 5 years warranty: good!): well, running VMs off of them should be OK, hopefully...