Sorry for the delay in responding. (New grandson arrived 2 weeks ago... birth complications & a Caesarean; grandma is on call for just about anything...)
Back to the Kindle. I have to confess that since I bought an iPad, I use it for eBooks more than the Kindle (although the Kindle is still best for reading outside - you can read it in bright sunlight, whereas the iPad screen is hard to see). I like the iPad better because I can just tap pages or icons instead of having to use the little joystick to navigate (Kindle). HOWEVER... I see that Amazon are at last bringing out a Touch Kindle - on their website it says November. That would be better than the one I have.
Back to the iPad: you can get a Kindle app (and a Borders app) so you can order eBooks from both and download them to the iPad. You have to visit the Kindle store first, using your browser, and choose the 'download to iPad' option (once you've installed the Kindle app. on your iPad.)
I also like the iPad better because it's full colour (great for books with coloured illustrations) and I can read it in bed at night without turning the light on, because the screen is backlit like a computer.
Of course, the Kindle is much cheaper than an iPad - so if you just want an eBook reader for novels, then it would be fine. If you like checking email and watching YouTube videos and checking out websites etc, then the iPad can do all this as well.
One last thing: I have found it a bit frustrating trying to order books that I like from Amazon only to find that many of them are not yet available to readers in Australia. I know that it can take a few months for us to get a paperback after it's released overseas, but I do find it annoying if I go to Big W or somewhere, see a recent large-format paperback release, but STILL can't order it as an eBook. There are various complex publishing laws that cause this, and it bugs me!
Still, there are a gazillion books to choose from on Amazon that ARE available, (and some recent releases are too, of course) and I'm never short of something to read. I like the fact that I can download a book at 10 pm if I need something to read, and it's available within seconds. They're also usually cheaper than paperbacks; I commonly pay $6 -$10 for a book. There are also classic titles available free.
Hope I haven't confused you even more!