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Given a decent quality i.e. brand name charger, Kindle will draw the current that it needs and automatically switch over to trickle charge when the battery approaches full charge. And will usually charge faster from a wall charger than an USB port.
So your garden variety Samsung or Apple 5W USB wall charger or something similar would be fine. Cables can make a difference, cheaper and generic cables often have such tiny internal conductors that they have limited current capacity and will charge slower. I certainly wouldn't want a counterfeit Apple charger though (e.g. off Ebay). I've measured some of those and some of them could damage your devices and arguably constitute a fire risk as well.
All that said, if you are not time-sensitive with regard to how fast Kindle charges e.g. you charge overnight, then you can extend your battery life by charging your battery slower. Not many people have chargers where you can set the output current. But you could use a 0.3A or 0.5A charger, rather than a 1A+ charger for a less harsh charging cycle.
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