I also have a 2010 Zero DS and fortunate enough to have Zero located within 10 miles from where I live. Awesome company and great people, I did a random drop by and they showed me their full 2013 lineup as well as invited me back to take all of them out for a ride! Jealous of the 2013's! Curious which battery pack you went for?
For my 2010 DS I made my own rear luggage rack where I can tie down my gym bag and other misc. stuff to. I also went with the Orlieb throw over saddle bags, highly recommend and they work pretty well. Great for food shopping.