I love the Kindle. I have an ancient model that I use frequently, because I like the fact that the screen doesn't glare and it doesn't do fancy things like surf the internet. Just pure reading nirvana.
Amazon has released a new version of the Kindle, the Kindle Oasis, and I might have to splurge for this. For starters, it's got a beautiful 300 PPI hi-res display, and it reads like paper in bright sunlight or low light without a glare.
This Kindle is also waterproof, and allows you to pair bluetooth headphones, and has Audible baked in so you can listen to or read your books, depending on the mood.
Finally, the storage options go from 8 GB to 32 GB, depending on your needs.