@zatnosk
I have a Kobo, and it is great. You don't even need any software; you can copy files directly as you would do on a USB drive. EPUB support is really great. For PDFs you better get a big screen; panning on e-ink devices is unbearable. Calibre is not required, but it helps if you have
a big library.
@zatnosk
Mine has wifi for Wikipedia and a real web browser, but browser and e-ink is not a good match. It's useful for quick searchs only. It has Pocket support, which works really nice for reading long web articles.