For a 20 mile ride where you don't need to carry anything just about any bike would work. Do you plan to use the bike for anything else or will you just be commuting to work? For just commuting the Novara above might be a good option. If you want a nice road bike for other types of riding but also do this 20 mile ride then the ones in your original post would be good options so long as you are not too concerned with rack/fender options.

As for tires, anything from 23mm to 35mm or more will work for a 20 mile ride. I've done over 100 mile rides on 23mm tires. 25mm tires seem to be a good size for road riding with just a bit more comfort. On typical road bikes like you listed above a 25mm or 28mm might be about as large as you can go. The tires that come with whatever bike you buy will be fine for doing 20 mile rides and longer. Wear them out and then decide if you need better flat protection, comfort, wet traction, speed, etc. and look for the tire that gives you the best mix of what you want.

Components are not as important as some people make it seem. Anything from Sora up would be fine for most types of riding. You get slightly lighter and somewhat smoother performance with higher level components. The conventional wisdom is that 105 is the best price/performance group.