Today I borrowed a copy of Πόλις, Speaking Ancient Greek as a Living Language from a friend. Obviously I haven’t completed reading it yet, but I’ve read enough to know that I can recommend it. The forward alone is worth the price of the book. It gives the best argument I have seen in print for beginning your study of Ancient Greek with the koine dialect. It also gives a very well written explanation for why learning koine Greek as a spoken language is the correct path to learning to read texts written in that language.
I’m ordering my own copy tonight!