How much do you ride your bike now?
When you start commuting how much will this increase your time on your bike?
If commuting will greatly increase your time on your bike than you might want to up grade to more hand positions and skinnier tires for less rolling resistance. you will probably want to make shifting better if your going to be in the saddle more often. one of your decisions should be based on how much time you will be in the saddle when u start commuting. it could be very beneficial to up grade if more time in the saddle is going to be required.
all the best!!