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I can only answer two. I have a blue 505 and the color is actually embedded (can't think of a better way to describe it). I chipped my reader (chunk off the corner) and the color goes all the way through. So no, it won't wear off.
The 300 does not have audio capabilities, but the 600 does. I recommend just getting a cheap MP3 player for audiobooks though. Audio will drain the Reader quickly, and it's not going to be the most optimal player. Although I know some who love this feature.
As for the 600, it seems like it's one of those things you have to judge for yourself. If you don't have the opportunity to check it out in person, and the 300 sounds good to you, then just get the 600.
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