I am in a quandry. What to read next?

So, last week Jim Butcher's new book came out, The Aeronaut's Windlass, first book in his Cinder Spires series. I'm not particularly into steampunk, but it was a lot of fun. It's not The Dresden Files, but what can be? Also, the man really knows how to write a cat's perspective. It's uncanny.

After I finished that I had some time to kill before this week came around. So I started in on Joe Abercrombie's The First Law trilogy (thank you for the recommendation, Patrick Rothfuss). I'm almost done with book 3 (they're all pretty good, but book 1 is really the best IMO), just in time because two new books came out today.

And therein lies the problem. I picked up two new ebooks (wtf, iPhone, "ebooks" should not autocorrect to "snooks." What the hell is a snook?) today. One of them is the first entry in Rick Riordan's new series. He did Greek mythology with Percy Jackson (technically Roman mythology too with Heroes of Olympus). He did Egyptian mythology with The Kane Chronicles. Now we have Magnus Chase and The Gods of Asgard. So that's my first new book today, The Sword of Summer.

Secondly, there's Brandon Sanderson's new book. It's the second book in his Mistborn Adventures trilogy. He said after the first Mistborn trilogy that the series would be a trilogy of trilogies. This is the second trilogy, but it's not the official second trilogy. It's an unexpected bonus trilogy that's set between the first trilogy and the planned second trilogy. Why? Because Sanderson writes a ridiculous number of books but never what you think he's going to write. So that's choice number 2, Shadows of Self.

What do you guys think? Which one should I start next?