Get a screen protector. Some people say "you don't need one the glass is so hard". But many have gotten scratches on their screens. All it takes is a little sand in the pocket, sand easily scratches.
For cases, the otterbox commuter is probably the best all around case but they're not out yet. I bought a cheap 4$ case on ebay to see if I even want a case with this phone since it's so big. If I like the case I think I"ll try and wait for the otterbox to come out.