2013 has been here for months in the bike world, so availbility shouldnt be an issue, although the Cannondale looks to have a bit of a lead time depending on size.
For spec, all look similar, 2013 9 speed Sora is a massive upgrade over 2012 8 speed, and worth paying a premium for.
For commuting, hard to tell from the pictures, but none of them have seem to have mudguard or rack mounts, mudguards are very useful if commuting (or just winter riding in general), and a rack could be, depending on what you need to carry. would be worth checking the max tire size for the bikes, as all are probably limited to 25mm.
Have you budgeted for a decent lock, lights etc? If you are going to be commuting in the evening / dark, a dynamo front wheel could be an option.