You say year-round...does this mean that the bike will be your only way to get to work? Or can you drive/get a ride/take public transit when the weather is nasty? If the bike is your only option, I would highly recommend multiple bikes over one nice one. Set one up for bad weather - fenders, studded tires in the winter, cheap drivetrain components (since you'll destroy them in no time) etc. Set the other one up as a fast fair-weather machine. Consider buying used, especially for the bad-weather bike.