I have had trouble holding my 10 inch Viewsonic tablet so I went with the MoKo slim fit for my Nexus 7. I chose the carbon fiber surface but what I like is the wide, soft hand-strap on the back which helps me hold the tablet on my hand.
They have multiple colors and I hated to get black (because so many things are black) but the other colors were a bit too bright.
http://www.amazon.com/MoKo-Slim-fit-...s=nexus+7+case