An open post (5 out) motion offense would work against either man or zone. Against man, I'd run ball picks and off ball screens to open up shots. Against a 3-2, 1-3-1, or 2-1-2 zone attack from the corners and have your guards dive from the top. Just be sure to have the kids off the ball roll up to defend the fast break. Against a 2-3, attack from the top of the arc.
You can also run a 4-out, box post.