I'll second A Memory Called Empire being a great audiobook.
Of Banks' Culture novels, The Hydrogen Sonata is my absolute favorite, and the audiobook for it is stunningly good. That one is his last, but they are all mostly stand-alone.
The best audiobooks I've listened to in the last year was The Daevabad Trilogy by S. A. Chakraborty (The City of Brass, The Kingdom of Copper, and The Empire of Gold). The narrator is just fantastic, perfect for the language and lyric descriptions. The story starts out in eighteenth century Cairo but quickly moves to a magic-filled landscape and city of djinn. The series is an interesting alternative to typical Western fantasy.