If you are going to commute, it is likely prudent to learn a bit about maintenance. (Especially for a 34miles RT commute.) Just by reading, e.g. sheldonbrown.com and the SS/Fixed forum, etc. you can figure out how to 'ss' or 'fix' a bike in elegant or ghetto ways. It really isn't that difficult, and again, as a commuter you need to be self-reliant. Not many places have AAA for bikes.

There is nothing wrong with buying a ready made ride though.

Some of the bikes you listed sound like good options (trek). size is most important so a good bike that doesn't fit isn't a good bike. Others have already discussed parts availability. Think about fenders, etc. Plenty of threads on the topic, and again, sheldon brown has lots of good info as do other sites.