What is currently the best personal cloud application?

In light of the recent privacy scandals, I'm going to be setting up a personal cloud at home. I've seen a couple frameworks already (ownCloud being the best looking), but would like to get the community's opinion on the "best" one out there.

Best can mean several things:

- Secure in its implementation,

- Open source (can't assume that I trust the people who have made it),

- Has all the basic features (file browser/streaming, email, contact, etc.),

- Is visually pleasing.

Any ideas? When I choose a piece of software, I'll be writing a detailed tutorial on getting it set up on Ubuntu and securing it before it goes online.