Novan is right. And all of our brothers and sisters are. And I also found a few of salaf scholars(the Prophet Companions) narrate different saying, according to the tradition. It depends on how we want to express our humble prayers. But one thing, it must be within the proper teaching of the holy prophet(pbuh) himself.
one not far different but I like personally,
"Attahiyyatul mubaarakatus solawatutayyibatulillah, assalaamu'alaika aiyuhanna nabeeyu-warrahmatullahi wabarakatuh, assalamu'alaina wa'alaa eebadillah heesolihin"
Ashaadu allaa ilaa ha illallah, wa ashaa du anna Muhammadarrasulullah"
Allahumasoli'ala Muhammad wa 'alaa ali Muhummad, kamaa salaita'alaa Ibrahim wa 'ala ali Ibrahim,
Wa bareek 'ala Muhammad wa ali Muhammad, Kama barakta Ibrahim wa 'ali Ibrahim, fil'alamiin innakahameeddom majeed."
All honour, blessing, salutation and goodness is due to Allah, peace be upon you, o prophet, and Allah blessing be upon you, and peace be upon us and all the righteous servants of Allah.
I bear witness that there is no god but Allah,
and I bear witness that Muhammad is a Messenger of Allah.
Allah salutation on Muhammad and his family, as were the salutation on Abraham and his family. And Allah Grace be upon Muhammad and his family, as were the Allah Grace for Abraham and his family. In all the worlds, Allah, Thou art Most Praiseworthy, Most Glorious.
This is not slogans. This is how we pay respect and our devotion to Allah, and our prayers on behalf of the prophets. All of them. Those who don't understand what we are doing will say differently. The difference is clear as to whom are the right guided. Insha'allah.