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I'm not very technical, so I don't know if this will meet all your requirements. I like an app called SmarterPlayer, which I use on my Touch for OverDrive books and all purchased and free audio content except for Audible and Downpour, to which I listen in their respective apps.
It does support playlists. It has a lot of nice features, including bookmarks. I especially like the very granular speed options; 1.25X can be too fast for some books, but any book benefits from 1.10X, IMO. The caveat is that I don't know how well, or if, it works with Audible; I like the Audible app well enough and it's so much easier to download directly to it rather than go through iTunes that I never tried it.
At least when I got it, it was free, so it wouldn't cost you anything to try it.
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