What dua can I say between "Allahumma qaatil al-kafarata..." and "Allahumma iyyaaka na‘budu..."

I was reading The du‘aa’ (supplication) that the Sahaabah used to recite in Qunut al-Witr in the second half of Ramadan during the caliphate of ‘Umar ibn al-Khattaab . It says: > Then he would send blessings upon the Prophet (blessings and peace of > Allah be upon him), and offer supplication for the Muslims, asking for > whatever he could of good, then he would pray for forgiveness for the > believers. What words can I use to "send blessings upon the Prophet (blessings and peace of Allah be upon him), and offer supplication for the Muslims". Please give me some dua from sahih / hasan hadith which I would place in the middle of: Allahumma qaatil al-kafarata alladheena yasuddoona ‘an sabeelika wa yukadhdhiboona rusulaka wa laa yu’minoona bi wa‘dika wa khaalif bayna kalimatihim wa alqi fi quloobihim ar-ru‘ba wa alqi ‘alayhim rijzaka wa ‘adhaabaka, ilaah al-haqq and Allahumma iyyaaka na‘budu wa laka nusalli wa nasjud, wa ilayka nas‘a wa nahfid wa narju rahmataka rabbana, wa nakhaafu ‘adhaabak al-jadd, inna ‘adhaabaka liman ‘aadayta mulhaq