I'm in Canada and am very happy with my decision to buy a Kindle. I looked at the availability of around 30 ebooks on my TBR list due to geo restrictions and there wasn't much difference between Amazon and Kobo/Sony. Amazon prices are in US$ but they are slightly cheaper than Kobo/Sony. If I can only buy a book in ePub format I am comfortable converting it to mobi, but the free books are generally available in both formats.
I wouldn't consider the Nook only because I haven't seen one IRL but I did look at the Kobo, Sony 650 and the Kindle before my purchase and felt the Kindle was the best device for me. I'm sure your wife will like her Kindle.
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