If I were to be stranded on a desert island with only a couple of books at my side, I would choose of one of them to be by my favorite poet. Rumi. Yes, the 13th century Sufi mystic. And Coleman Barks is my favorite translator because he makes the words practically leap off the page.
There are several books available, so you can go candy shopping if you'd like. But if you want one recommendation, I would offer The Essential Rumi. It's delicious reading.