No specific suggestions, but sort of a half-anti-recommendation:

I used to own a Tolino Vision 2. It was a great device for its purpose and time - lightweight, sturdy, very pleasant e-ink screen and backlight, easy to use and didn't mind a little sand or water. Sadly I lost it.
The new models I could try out look even nicer, but they all share one common problem: half of the home screen is an online book shop that can't be changed or hidden. That was reason enough for me not to buy another one.
If you don't mind that and Tolino devices are available where you live, they may be worth a try. Otherwise I recommend you steer clear of them.

As for the DRM issue, de-DRMing with Calibre for some reason didn't work for me (quite possibly a wetware problem), so I ended up buying ePubor Ultimate, which works very well and can do a lot of things but isn't free.