Did you read the stance section in this thread? Supreme Blade Parry is TERRIBLE. If you want an example of a melee opponent at level 17 look at the Frost Giant Jarl. DR isn't worthwhile unless you can absorb at least 1/4 of its damage.What do you think is better between Supreme blade parry, hearing the air and press the advantage?
I don't know much about Press the Advantage, but if Hearing the Air wasn't your 9th level stance, I hope you made it Dancing Blade Form. Unless you have a Blindfold of True Darkness, get Hearing the Air.