The reader hardware is the last thing you need to worry about.
First decide what you want to do with ebooks and *where* you're going to get the books.
Then you can decide how much *you* care about specific features like wireless, touchscreen, physical buttons and keyboard, dictionaries, search, note-taking & highlighting, TTS, typography overrides and customization, to say nothing of screen size, battery life and ergonomics.
I don't think nationality is likely to be the best discriminator for picking a reader that meets *your* needs but since it's your money you're the best suited to decide what matters to you and how much.
It's not that hard to draw up a weighted wishlist and then see how the existing commercial products stack up. You might even find it an educational experience.
(The methodology works for a lot of things in life.)
