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Nice list Rosie. I'd like to add a few early and/or Orthodox resources:
Excellent.
May I also add True Devotion to Mary by St. Louis De Montfort
There are also a couple of titles we'll hopefully get in the Popular Patristics Series, Part 2 or 3 relatively soon: SUGGESTION: Popular Patristics series by St. Vladimir's Seminary Press
And I've been nagging about Raymond Brown et al: Mary in the New Testament. A Collaborative Assessment by Protestant and Roman Catholic Scholars: Some ecumenical books.
Another fairly ecumenical one would be Br. Max Thurian: Mary: Mother of the Lord, Figure of the Church. (He was the 'chief theologian' of Taizé and an observer during Vatican II. Born Reformed, but rumours say he converted to Catholicism a few years before his death (long after this book was written).)
And then there's Scott Hahn, of course (but I suspect that will turn up before New Year whether we suggest it or not).