No color screen is going to be readable in sunlight. You didn't mention what size you were thinking of. There are smartphones and the iPod in the smaller sizes, and 7" tablets. If they are Android, the app availability for reading is all pretty much the same. Battery life of a color screen is not going to be nearly as good as an e-ink reader.
Were you interested in paying for 3G connectivity, or is wi-fi enough for you?
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