The Nano, by comparison, costs the same, features half the storage capacity and has a smaller two-inch screen.

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For starters, customers comparison shop for both price and features.

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By comparison, the CityCenter complex, which features the upscale Aria casino, spreads across 67 acres.

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The Aura HD has other best-in-class features, like remarkably even lighting (the illumination of the lighted Kindle and Nook models is splotchy, by comparison) and, thanks to a zippy 1-GHz processor, faster page-turns and a more responsive touch-screen.

WSJ: The Best E-Reader: Kobo's Aura HD