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The top speed probably doesn't matter, as you are highly unlikely to notice a difference using top speed as compared to class 2 or 4. The speed ratings of these cards were originally intended to relate to users of high-speed cameras and video recorders, in which faster write speeds are important for capturing lots of data. For simple reading of ebooks, the speed rating is not as relevent. The only relevance is that a class 10 card will write faster than a card with a lower rating. But this will only be noticeble if you are transferring a lot of data at a time.
For my nook, the last card I bought was a class 4. Works well, and cheaper than the class 10.
Vic
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