Jerry, we just had an international choir festival in Montana, held in Missoula. I saw/heard some of the singing on our local PBS station. The South Korean choir in particular was stunning.   Here is a link to the list of choirs participating from around the world, Australia, Wales, Estonia, India and more.
http://www.choralfestival.org/2006/schedule.html
Read the About Us history of the festival.... choruses from all over the US and world. Maybe you should contact them about your chorus!