Personally I prefer a gel case like this one :
Feels better, and grip. I don't like something that close, can't see the wallpaper.
It's a Kindle 4 case though, so it's not exactly the same size, but I worked some miracles. And in the holes for the old light connectors, I fit a cordelette, in case I drop it.
Ye don't like leather cases much, especially for holding it in one hand afterward it's a bit weird.