Just my 2?
I think you should major in something interesting, off the beaten-path (for-premeds) and exciting to you (unless the beaten-path is exciting, at which point, yahoo!)
If you go to med school, you will never really have a chance to do the things that you can do now. So, take music classes, art history, a wine class, a dance class, play an intramural sport, do something outside of the sciences. Make it so that you can speak intelligently about more than just your "double major" stuff.
I don't know you, so I am making certain assumptions, but you will be a more interesting person to an interviewer, and anyone else for that matter, and a more well-rounded individual in general (my god! is that important to anyone else but me?). There are just so many truly boring people out there....
Take it or leave it really. Just my opinion.
Cheers!