Well, Kobo handles sideloaded ePubs without DRM, so it would be fine for Smashwords and Baen stuff too. That only leaves the Sony stuff...
For the ePubs, the Android readers that support Adobe DRM right now are Aldiko, Mantano, Nook, and Sony. As long as you can get ePubs from Kobo, you could use one of these apps (the first three, at least) for everything, although it still might be more convenient to use the Kobo app if you buy a lot of titles from them.
Unfortunately when it comes to LRF, it seems like none of the reader apps support it, so you'll probably either have to get updated versions from Sony somehow (if that's even possible), or convert them with Calibre.
Good luck...
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