I say, and with God's success: It is preferable to recite the remembrances and Ayat al-Kursi and others after the Sunnah prayers. We should perform the Sunnah prayers immediately after the obligatory ones, and we separate between the obligatory and the Sunnah by saying: "O Allah, You are Peace, and from You comes Peace; blessed and exalted are You, O Lord of Glory and Honor," three times. And Allah knows best.