It doesn't get much better than the Apple leather cases from I've seen so far. I'm sure other "fine" cases might be out there or will be coming soon, but the apple leather is pretty nice.
Also it has been a very long time since I got a Vaja case. They're hand made in Brazil from fine leather. They aren't cheap but if you want quality materials and an attractive case, check them out.
http://www.vajacases.com/
You can customize them from about 25 different colors of 4 kinds of leather. Damn, now I'm thinking about ordering one.
Image
Image