I feel the same way. I've been playing a lot of Benoit and Peeters lately, especially for daily Mass. I love the Near-the whole St. Augustine Organ Book is a little gem. I need to buy his Chantworks series. I've also been playing from Jeanne Demessieux's 12 choral preludes based on chant hymn tunes. Great stuff!
I think Gerald Near is very good. In addition to Chant Works there is his Liturgical Year Volume 1, a sort of Orgelbuchlein based on Chant. The first volume goes from Advent to the beginning of Lent. I hope he someday completes the project.
For something simpler, Callahan has a two volume series called, Chant, published by Concordia(I think). The pieces are fairly easy and keep them in the organ bench just in case I need extra music.
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