I'll jump in here, after 5 years. I have a small collection of SACDs and only 2 DVD-As, but I really like Verdi's Requiem, conducted by Valery Gergiev on DVDA (Phillips/Decca), and an organ/orchestra collection on Ondine, which includes Samuel Barber's Toccata Festiva, Francis Poulenc's Concerto for Organ, Strings, and Timpani, and my all time favorite composition in this genre, Camille Saint-Saens Organ Symphony.
I also have the RCA Living Stereo SACD release of the Saint-Saens which also sounds spectacular! It was recorded in 1956 on a 3-track recorder, so is that considered "Multi-channel"?