how bout a touch of tuba... I think there is a piece by Robert W. Smith called after a gentle rain which is the very nice slow movement of his "Willson suite".
Pensacola Symphony
Troy University-adjunct tuba instructor
Yamaha yfb621 with 16’’ bell,with blokepiece symphony
Eastman 6/4 with blokepiece symphony/profundo
Jan Krzywicki's Ballade has been transcribed for band. I believe Sumner Erickson did it in Texas recently. It's a gorgeous piece that is underplayed, in my opinion.
I'll second the Willson suite by Smith, pretty darn sappy, but pretty none the less. Another one you may look into would be the Wilhelm Concertino's Second mvmt.
Eric Hamilton
University of Tennessee/Knoxville
Performance Major
Kalison Daryl Smith CC
Yamaha YEB-321 Eb
UT Symphony/Wind Ensemble http://www.hammytuba.com/
I second Bill's suggestion. Suite for Louise was my first solo piece! It was some time ago but I remember it being very melodic and down-right pretty. If my highschool band could handle the tune your band should have no problems.