My favorite scaled down version of the Durufle Requiem (probably because I know some of the singers and have heard them perform in concert and at a few funerals) is the Voices of Ascension recording on Delos, surprisingly called The Durufle Album. If you can find it (long since out of print, as Delos sadly is no more, I believe), one of the things I like about it is that the women in the choir pretty much sing straight tone (little or no vibrato), which fits the piece beautifully, since it is based on plainsong chants.
The Herwigge discs mentioned by Newbee are excellent versions of the Faure.
The Herwigge discs mentioned by Newbee are excellent versions of the Faure.