The V:8 gives the option of an internally mounted battery within the seatpost or externally mounted close to the bottlecage on the downtube.
Wheels are an important choice when buying a disc road bike. The benefit of a carbon fibre rim comes into its own when owning this bike. Take advantage of using wheels designed specifically for disc road bikes. Rims can become lighter due to not having to reinforce the braking surface due to heat build up from rim braking. Weight saved from the rim is counteracted by a few extra spokes to withstand the disc braking forces, a few extra spokes means a stiffer wheel, increasing performance.