I will admit that a lot of the impetus for this purchase wasn't because I was convinced that the sixth printing of this book was a vast improvement over the previous five, but because I tend to be a bit of a completionist when it comes to my game collections and because, quite honestly, when you've gone into your FLGS a half dozen times or more and never bought anything but still use their bathroom you start to feel a little guilty.
Castles & Crusades is also my favorite "retroclone" that doesn't actually drive me nuts for being too much of a retroclone. Although to be honest, 5th Edition D&D also feels a hell of a lot like Castles & Crusades. I think between those two and 13th Age you pretty much have the "what WQRobb wants out of a D&D game" covered.
Now, the RPG purchase previous to that one is a bit more interesting and noteworthy...
Icons is not the superhero RPG for my gaming group, I know that. They are too self-deterministic when it comes to making PC's. But my kids have loved the game, especially my son who enjoys improv theater. (It doesn't hurt that his first randomly-generated PC, El Diablo, was pretty cool.) Regardless, I've already stolen ideas from Icons to drop into the next game of MHR I go, including the idea of team Distinctions.
I'm pretty sure that's it for RPG purchases for the last year. For a long time in my life I bought everything that came down the pipe, but lately I've been more interested in just getting a good game going, rather than always looking for a new ruleset.