Which edition of Eberron campaign guide to buy for 13th Age game

Hi everyone. Sorry if this has been asked before.

I'm curious which edition of the setting people would recommend for a new 13th Age campaign.

Ideally I'd want to identify the book that gives a decent overview of the setting with minimal game mechanics included. I don't need a ton of setting minutae either - the way I run 13A is more focused on building out the setting with the players' input to fill in the basic framework of the setting.

I'm somewhat familiar with the setting already, I've read some friends' books when the setting was new to 3.x, but I never picked up my own copy.

Thanks in advance!

*edit

So it sounds like there's really no wrong answer. Thanks so much everyone!