amp crossover setting for speakers with different frequency

[spawnofwar1600]

i just upgraded my fronts from canton 120 mx to paradigm monitor 7s , ideally speaking for sattelites the crossover should be 120hz , but what would the ideal setting be if we brought in the monitors into the equation,?

the centre and the surrounds r the same cantons..

my amp gives three options 80, 100 , and 120