Just buy a Kobo. You can get a new one, you don't have to jailbreak it to run Koreader, it already actually ePubs out of the box, they don't have as aggressive DRM either. And the hardware is good.

My Onyx Poke 5 is better than every Kindle I’ve owned.

It’s super compact (great for travel), has a good screen, reads anything I’ve thrown at it, runs Android apps, and is simple to send files to over its (local) web interface.