What is the top recommended e-reader for me [ read details ]?

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I am in the market to purchase an e-reader. I am finally making the leap from beloved ink on page to electronic data. This switch is largely due to school. I am able to rent the majority of my textbooks through my university's library. At first, my choice was to go with a kindle. I have thoroughly enjoyed test driving my father's kindle. It has physical buttons, and little page lag, which is great. However, all the library e-books are only transferable through Adobe Digital Editions, and the format is not compatible with Kindle. Normally I would be able to convert the file, but since the files are temporary (14 day loan), this is not possible. So my next thought was to try out a KOBO. As a Canadian, the Kobo and Kindle seem to be the two best sellers here for e-readers. Although when test driving it, the touch screen was not very responsive, and I found myself having to tap the book five times in order for it to open. I have also read a number of nasty reviews about Kobo and their customer service. Supposedly, complete freezes are not uncommon. One customer, after only having the product for two months, attempted to exchange her lemon. She contacted Kobo multiple times with no response. When she was finally able to communicate with them, they sent her a refurbished Kobo as a replacement for her practically brand-new one. Not cool in my books. So I am looking long and hard at Sony's PRS-T1, after reading several good reviews. However, maybe there is another e-reader that is even better? Or maybe you have had a bad experience with a recent Sony e-reader. Please let me know! The factors I am looking for are: affordable (yayy student), very easy on eyes (pearl ink, no backlight), responsive, WiFi, and ability to download rentals from libraries. Physical buttons are a plus, but not required. Thanks! Ally