The PocketBook[1] range should be a great option for you, especially since you're based in Europe. I don't have access to anything other than Kindles in my country, but that's not to say my experience with them (Paperwhite owner since 2012) has been bad at all.
Depending on your use case, most standard e-ink (preferably e-ink carta) devices should be just fine. I'd ask you to temper your expectations, however, if your workflow is heavy in PDF reading.