For the 320, 18C/D is still the "right" choice unless you value getting of the plane quickly - then the seats further up (other than 16) are a better choice, but as a Souper Elite we should leave row 12 open to our Elite compadres who have to pay for the other Preferred rows.
There is now much less of a difference in pitch between row 18 and the other premium rows - there's all pretty reasonable for me.