How far will you be riding and what condition are the roads in ? (smooth, full of potholes, cobblestones, etc).

What I would do is find a bike shop that would let you try a wide variety of bikes. Once you get the list narrowed down it would be great if you could rent a bike similar to the one you're thinking of for a whole day or even a weekend. Try out your commute during non-rush hour times.

There are different types of road bikes. Some are designed more for racing while others are for "touring". There are cross bikes which are road bikes designed for racing on off road trails. They can make good bikes for commuting because they take wider tires which smooth out the bumps. That's also true of touring bikes.

Or you may find that you like a completely different type of bike.