Calibre has my vote too. I'm new to ebooks like you (don't even have the device yet - hopefully tomorrow!) and have already got a few of my books loaded into Calibre with fully correct metadata added. Am only converting a few files at a time into lrf though as I want to make sure I have the settings I find best before commiting to bulk converting them.
Is awesome software and very user friendly. Have hard alot of good stuff about Book Designer too but they also tend to say the software isn't user friendly at all and takes a while to get your head around.
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