I'm a decent ways into Turn Coat (still all audio) with just two more full books to go... Maybe I
will get there before Cold Days drops
I've been mostly alternating with the Iron Druid books, which don't quite stand up to Butcher, especially for humor, but are plenty entertaining nonetheless.
I wonder, are other Dresden peoples also big Supernatural (TV series) fans? For me, all of the above scratch my horror/comedy itch, rather than fantasy, and I have a much greater appetite for horror than fantasy (which is not to say the two are totally distinct or unrelated). Iron Druid is a bit more fantastical (it's kind of a succession of WoW quests transcribed to Tempe) but Dresden is decidedly horrific, with the emphasis on vampires, demons, necromancers and other bump-going beasties.