I wouldn't get the Nook Glowlight for a few reasons. The first is that Barnes & Noble does seem to be slowly leaving the e-book business. That doesn't bode well for support if your device breaks. The second is that the it doesn't have an microSD expansion slot and only leaves 512 MB for non-BN content. So if you buy content from say Kobo (a very real possibility since Kobo frequently offers discount codes which makes the cheaper than B&N), you'll only be able to side load so many of those books onto a Nook.
The Kobo Aura and Aura HD both offer an expansion slot. They both have front lights and neither has ads. They also don't partition storage for non-Kobo content. The Aura is a little more than the Nook but for what it offers, I think the extra $10 is worth it.
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