I've had many a phone case and by far the best case I've ever owned is on my Note 2 right now. It is a Trident Aegis (
Genuine Trident Aegis Case Samsung Galaxy Note II 2 AG Sam GNOTE2 BK Black | eBay)
What I like:
Flexible yet sturdy
Lip around the screen so it protects when laid face down
Rubberized corners protect against accidental drops
Port covers fit perfectly and keep dust out of the headphone and usb
buttons work flawlessly
Opening for S Pen does not impede use, or make it difficult to remove the stylus
perfect amount of bulk - adds needed protection against drops, but doesn't make an already large phone obnoxious
Doesn't impede the use of screen protector
What I don't like:
No kickstand