A screen protector is a must. The SPIGEN SGP Clear Steinheil (Ultra Olephobic) is the way to go.
Amazon has a number of nice cases at great prices. I went with an Ionic Guardian Case, which is similar to the Commuter, an Evercase Leather Wallet Case with Stand and Credit Card Holder, and a Clear X Line TPU Gel Back Case. I got all three cases for less than the Otterbox. I use the Guardian and Evercase the most.
I also recommend two additional accessories. The iOttie One-Touch windshield and dashboard car mount. It works well, is sturdy, and inexpensive compared to the stuff in the Sprint Store. Also, get the Samsung EPL 3FHU HDMI Adapter. It allows you to output your Note 2 display to your big screen tv. I use the adapter in conjucntion with a bluetooth mouse and keyboard and the Rotation Control app by FaMe IT to use my Note 2 as a workstation. This device kills as a smartphone, and it rocks hard as a pc.
BTW - I do not work for any of the manufacturers that I listed!