I have this for my Vizio E40-C2: http://www.amazon.com/gp/product/B00FF0MJXG
It's only rated for 42" though, but I'm sure there are equivalent products for larger sizes.
It's perfectly stable, and mounts to the VESA mount points. You can rest the center channel on the feet too, although since they slope downward towards the front you'd want to prop the front of the speaker up a little bit too.
So the CNET links says the mount points are 600 x 400 mm which should fit VESA standards. Which should work with this stand. Thanks!
There are a bunch like that if you Google 'tv stand vesa mount' but check out this other one, super slim https://www.amazon.com/Atlantic-Table-Top-Stand-Black/dp/B00FF0MJXG
Edit nvm, only goes to 42", but seriously there's a bunch out there.
Look at Atlantic they have one model that might work.
http://www.amazon.com/Atlantic-63607103-Table-Stand-Black/dp/B00FF0MJXG
Shop jimmy has several. On mobile right now so its hard to look up specs of your tv
http://www.amazon.com/gp/product/B00FF0MJXG
I'm pretty sure all Vizio TVs have VESA mounting holes, so something like this should work. It sucks that you have to use an aftermarket solution, though.