My 2-cents worth. Need to first decide on the purpose served by YOUR case.
My needs are: protect the screen; protect N7 from bump and drop damage; light in weight; good tight fit; carry all my N7 junk - (stylus, cleaning cloth, earphones, cable, flash drive, SD reader, pen and paper - perhaps a charger cube).
N7 is so light and easy to hold that I'll probably be using it out of the case.
Seems that fitted cases add too much weight and bulk (for me). Also, little room for storage. My best choice is a small neoprene case with exterior storage pouch. No need for access to N7 ports and buttons. Generic is just fine. Not very stylish -- but very practical (for me). Probably can find one for under $10.