Keep it stock. Buy a rack, a nice bag for the rack, a couple of water bottles and some cages, a capable pump, emergency tools, a couple of spare tubes. If you want a little more aero position flip the stem and/or rearrange the spacers on the steerer tube so you'll be in a bit more of an aero position. But for God's sake, first ride the heck out of the thing for at least 6 months before trying to make it go "faster".