Play Advice for our team

My 6th grade team has 2 pretty good post players and a good guard on the floor most of the time. Our league plays man most of the time but the rules allow them to get into what I like to call a soft zone.

I'm going to run motion, but do you guys have a recommendation on what motion set to run?
I like the 1-3-1(your cutters play) but can see where the 1-4 high would be good too. What do you think about the stanford motion play - http://www.youtube.com/watch?v=VSiANn5r5HU

She refers to it as a continuity play but I like that it has repetitive movement.

Thanks guys

You might think about a hi low set at times, with two good post players this is hard to cover.