The next strata, representing a good few happy years trawling Christian bookshops, would look something like this: Rob Bell; Dallas Willard; Phillip Yancey; Richard Foster; Brian McClaren; ooops - a Joni Mitchell music book and some Revised Common Lectionary preaching tomes appear to have crept in.
I would have to add Joyce Hugget's Listening to God, The Four Faces of God, Bickersteth and Pain, and anything by John Bell, just to stir things up.
From here the strata get a bit more gritty as these appear: Exclusion and Embrace, Miroslav Volf and the slightly easier to read version - Other by Kester Brewin; Alister McGrath; a bit of Colin Gunton; then John McQuarrie and John E. Colwell for sacramental theology; oooops - here's The Rattle Bag, brilliant poetry anthology complied by Saemus Heaney and Ted Hughes; Your Church and The Law (yawn) The God Delusion (you gotta be fair minded) and of course any Lesslie Newbigin (watch that spelling).
Can you get all that tactile enjoyment, that history of handling, annotating and cherishing with a Kindle? Call me old fashioned, but I think not. Happy World Book Day.