As Bill said once you get one Dynamo, they will start to prolferate. I really don't build a bike or front wheel without one now. The SP's like the one that was linked to are my "go to" now because you can get them for $100 or less & they are small & light. The newer SP's may be better, but are a bit more expensive & harder to find so I haven't tried one as of yet. Honestly, even some of the Shimano's are OK as well & I've picked those up for $50 or less. Regarding moisture, yes under those circumstances moisture could get into the hub, but unless you are dunking the bike in water or going through a deep stream you would be generally looking at condensation and it would take a long while for this to have much effect.
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