Here is a web page showing Adobe Digital Editions (ADE) compatible e-readers.
http://www.adobe.com/products/digitaleditions/devices/
I am shopping for an e-reader now. My main considerations are low cost and ability to read e-books checked out from libraries. Right now I am leaning towards the Aluratek Libre Reader Pro. I like the included dictionary and user replaceable batteries of the similar Jetbook Lite, but as of now it doesn't support ADE.