Mr. Y and I have read the two books Jibrail mentioned and they are quite good. We also have Aflame: Ancient Wisdom on Marriage
, which turns out to be quotes from Orthodox fathers about marriage. Interesting stuff, but equivalent to the little inspirational compilations you see at Hallmark. The other one we own is Preserve Them, O Lord: A Guide for Orthodox Couples in Developing Marital Unity
by Fr. John Mack. This one is also a workbook for engaged or newly married couples, much like Dr. Kalellis' book. I found that one to be a little cheesy and dated in parts, but it does have good advice on things like dealing with conflict and planning for children. It also has several recommended readings that I've not read: Plain Talk on Marriage
by Fr. Gordon Walker, Crown Them with Glory and Honor
by Fr. David Anderson, and some others.
One I just saw on Amazon is On Marriage and Family Life
by St. John Chrysostom. The link takes you to the Amazon page; there are several reviews of the book there. (Sounds like a pretty good one... I'm putting it on my wish list.)
Good luck and best wishes!
Let us know if you need help planning or need Orthodox wedding supplies... I think I've combed the galaxy finding all the neccesary bits for our wedding and we did the whole thing for around $6000 total. (Though $1500 of that went toward the reception hall... ouch.)