Major Work for High School Choir Assignment?

Hello! I am a Music Education student and for an assignment we have to come up with an annual program. I am currently in many choirs (at the university and community) and did choir from 6-12th grade.

For this assignment we have to program a “Major Work”, which can include a small string orchestra and soloists. Some examples (that we aren’t allowed to use) are: Vivaldi’s Gloria, Rutter’s Requiem and Haydn’s “Little Organ Mass”.

In all my years as a singer the only major work I’ve performed is Lux Aeterna and that is far above what my high school could have done.

My question is: What are good major works for a high school choir? Bonus if it’s not in the “standard” repertoire. I’ve thought the All-Night Vigil could be good but maybe above the level of most high-schools.