I am using Face Art Woo Commerce Theme, which is latest best word press theme known to me so far with multiple of features.. The best thing is this that it has fully responsive theme. It is well-structured and commented code for easy customization. It is easy to use and customize.. It is last update on 27th Dec 2014, Its all plugins are updated and best for all. I personally suggest everyone to use it at least once..
For further details and queries regarding best word press theme here is a website which also helps me a lot in finding best theme for me :