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I can't give you actual experience, but one bias I'll have the next time I buy a portable recorder will be to get one with multiple mics and hardware noise cancellation. My TP2 has this tech to clear audio for speakerphone calls, and I like it there. The mic further away from the voice helps filter out non-voice noise. My favorite (not that I have, but that I want) bluetooth headset, the Voyager Pro, has similar tech to limit wind and background noise. An alternative solution that is probably more common is an omni-directional mic.
It's probably not a solution that prevents you from needing software for something like an audiobook, but it seems to me like it would be a nice helping hand. In some cases, a poorly designed system will affect voice quality as well as reducing background noise, so read reviews of any solution carefully.
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