For those interested in alternative versions of the Requiem like the Maunder; the new version by Harvard professor and very fine pianist Robert Levin, recorded by the Boston Baroque, is very good. I've performed it as well, with Dr. Levin in attendance.
If you have seen a pianist Robert Levin on CDs of Mozart Piano Concertos, it is the same person. Dr. Levin improvises all the cadenzas on the spot when he plays Mozart, unlike most artists who just play a cadenza already written down. He is fun in concert, because you can go to every performance and rehearsal, and every time the cadenzas are different. Quite a creative guy!