Bluefire Reader should be close to shipping their Android version. At that point you will at least have a choice between EDge Reader and Bluefire for everything (it supports Adobe DRM, ePub and PDF, and should work with Dropbox also). I haven't gotten txtr yet for Android but at least on iOS it doesn't support any sort of side loading so you have to upload to your txtr account, where only txtr can get at it. Inconvenient most of the time.
I gather Aldiko 2.x does not work on EDge otherwise that might be an option also.