You certainly appear to have got a sound grasp of the basics. Unfortunately there is "ideal" device (or we wouldn't be having these discussions!).
Most devices on the market today, including the Kindle, but excluding the Sony, can read MobiPocket format books, so buying a device which supports Mobi gives you the maximum flexibility. It is very easy to buy books in a "neutral" format such as Microsoft Reader format ("LIT") and convert those to Mobi format using free tools (it takes literally seconds to do).
The Kindle is an excellent device. There are, however, other choices, such as the CyBook Gen3 (which I have myself), and the EZReader.
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