(55$) AA early position

What is your preferred method for playing AA in early position with one maybe two limpars already in ahead of you. Its early in the tourney so hard to have a good read but assume the table seems is fairly typical 2+2 play. I know the preference would be to isolate a LAG but what size raise have you found to be most effective? I realize good players vary their play but what you found to provide the most desired results. I have a specific hand in a recent tourney I am referencing but wanted to get an idea of more general play instead.