I wrote a bare bones "store-and-fetch" [dotfile tool][1] that's been working well for me, mainly because it's easy to set up on a new device and it delegates a lot of functionality to GitHub. It's more or less equivalent to the "Git repo in home" approach, it just streamlines the `git commit`, `git push`, `git pull` workflow.

[1]: https://news.ycombinator.com/item?id=9989185