Kindle is only available via amazon (com or uk, in fact best registered with both to get deals on ebooks from uk or us), regarding repairs I have dropped mine a few times and the bag it travels in (not yet bought a lit case) and not yet had to repair it, although the back did pop off at Heathrow airport (48 hours after getting it in my paws!) but it popped back on easy.
I agree with other posters about the screen on ereaders vs ipad/tablets. The screen on my kindle is great, looking almost like ink on paper with no eye strain (even reading in twilight, I just enlarge the font a bit)
I would definitely try and get your hands on as many as you can, I live in CBD and happy for you to have a play with a kindle after you have tried the others as I'm not sure how you would try one without buying.