I will only come back to Dropbox when I can have client-side encryption.
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I use CryptSync on Windows to auto-encrypt/decrypt files between a folder outside and a folder inside my DropBox area. It uses 7z under the hood which is OK for most uses.
I'm confused, can't Dropbox still read your files?
One could (in theory) use Dropbox to store the encrypted ~/.Private directory. For example by making it a symlink pointing into the Dropbox directory. And it could be auto-mounted using the Encrypted Private feature at ~/Private. It would probably work very well as ecryptfs only does file-by-file encryption, and thus Dropbox can efficiently track changes.