I started out (in recent years, previously had an old B&N Nook Simpletouch) with a Libra H2O. It was a well-made device, Kobo is a good company.
Currently I use a Boox Page (7 inch) for reading and a Boox Go (10.3 ich) for studying and notating.
Downside for Boox is the Chinese firmware that's basically a black box. The upside is they are the most flexible of any e-reader regarding self-hosting your own library and syncing across custom or personal services. I've been happy with the devices overall.