I like Benjamin Britten's "A Ceremony of Carols," "Rejoice in the Lamb," and "Missa Brevis." I have the three on a truly wonderful old Argo LP. Maybe it's even somewhere on the net. Definitely worth searching out.
A lot of Baroque can also be considered "sacred", being as church-based as it is (J.S. Bach's day job was as a church organist, and a lot of his compositions were written to be performed on Sundays). Baroque is my "go-to" Classical music.
Einaudii is great. Perhaps he falls under the heading of minimalism and my favorite in that grouping is Arvo Part e.g. Alina is very bare and soothing.
There is also a CD called Ancient and Modern by Anne Dudley with the best track here:
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