Nexus 4 - Great apps and cases

Hey there,

I just bought a brand new Nexus 4, and I'm looking into two things:

1. Apps. Really good apps. With a great design. Apps that can beat iOS apps. Do you have any suggestions for great Holo designed apps? And not the really common popular ones, but more niche apps, but with great qualities to them.

2. A good case. What case, considerably cheap but tough would you recommend? A one that looks good and clean, but can protect the fragile device.

Thanks for the help :)