I'm going to take Jerry's suggestion about submitting several tunes and letting the members of the band vote on which one they like best.
This one I can hear as a large-group-big-band thing. I think it would need a little more section stuff in there, solis or whatever they're called, to beef it up some, like a cool ensemble thing between solos, something like that.
The concert line would be the trumpets and the piano line would be the saxes. I'll leave all that up to whoever arranges it.