This is a very pleasant listen. You are one talented guy Dave!
I think the whole mix could use a tweak or two and I'm not helping much if I don't offer what I think might help. I think if you roll the low end off the horns and give them a reverb plate, it will give them that bouncy feeling that real horns would have in a small concert hall. Where you say "take it away boys"...I would add a trumpet solo or something JMO. The drums could use another sample if at all possible, maybe something more acoustic sounding. You could experiment with reverb to give the whole thing some space, but I would only add a small amount . If you can pan the horns separately that would help to give more dimension to the mix....all in all though a great start to a good song!