SSHFS
I've been meaning to try out OwnCloud and FreeNAS as well, but SSHFS is reasonably secure and easy. If you have a reasonably fast connection at home, punch a hole in your router to allow remotely mounting a filesystem via SSHFS. Works fine for streaming music, and allows full access to stuff I don't want to pollute a work machine with.
For a GDrive/Dropbox/etc replacement, try Sync.com. 5GB initial account, but easy to get rewards. Encryption-heavy (key-based, fully held by user), privacy-minded, servers hosted in Canada (though I'd be surprised if the NSA hasn't tapped that - NSA data fetish > 4th amendment or international law).