I have a 28 mile RT commute that I do year round. I really only ride my road bikes for the commute (unless I am meeting a group to go mountain biking before or after work).
The bike that gets the most use is a 1982 Peugeot converted to a single speed. I LOVE this bike. At the thrift store, I initially balked at its $40 price tag but this thing has been worth 10 times that much to me over the last 2 years. It has clearance for 35s but I need to find something else for the fenders. It is comfortable and suprisingly fast (it can hang with my buddies on their fast bikes). It is so versatile, I can mount knobbies, slicks, studded tires. I can gear it or not in a heartbeat, depending on my mood, by simply adding a rear der. and a bolt on pair of downtube friction shifters.

My "nice" bike is a giant TCR 0 that is used about 70% of the time in the summer but never in the winter. It is very fast, to say the least.

I also recently bougth a cyclocross bike but have yet to figure out how to incorporate it into my commute as I really prefer to commute single speed but want to keep this geared up for off road riding. It has recently seen use on days when I ride off road at lunch.

All three have drop bars and I would not have it any other way. 14 miles is too far to ride sitting upright.