Which reader works best with Calibre these days?

So, I've been using eReaders & Calibre for many years now. (Started with a Sony, still have it.)

Besides Sony, over the years I've used some kind of Android tablet, a Nook, Kobos, and a Kindle, but I'm looking to upgrade again and I'm wondering which way to jump.

I'd like whatever I get to be water proof/resistant but, more importantly, to be easy to use with Calibre, with good support for collections, series, and so on, and preferably without constantly trying to advertise to me (which is the biggest reason I want to dump my current Kindle...)

Any suggestions?