local cloud storage solution
Did you take a look at OwnCloud and similar solutions? Not (yet?) as comfortable as dropbox, but open source, runs on Linux (so you can stick with your Linux-mount solution), and it has an Android app. For a quick overview, you might want to first take a look at this Wikipedia article. If that sounds interesting, next source to investigate might be e.g. How to Set Up Your Own Private Cloud Storage Service in Five Minutes with OwnCloud :)