Hi Rebecca, I hope people here help you. I joined when I was trying to decide what to buy and I found lots of really useful information. And lots of it was about devices I hadn't considered or even heard of. I learnt that there are lots of good devices, and you have to decide what really matters to you and find the reader that does that the best.
Judging by the many happy users out there you'll probably be happy with whatever you end up with.
Personally I went for a Sony 505, but the advantages of the Kindle are reduced for me because I'm based in the UK. I do love my 505 and it's great for reading on, so it does everything I need
When you have decided what reader you want then make sure you look at the free ebooks available here - lots for both the kindle and the sony.