Similar bikes at similar price ranges will be at similar price points among the major bike brands so fretting over components isn't particularly productive. My standard answer to this question is that for a n00b looking to buy a first road bike there are three things to be concerned about:

1) Make sure you pick out the right type of bike for the riding you are going to do.
2) Make sure it fits.
3) Find a good shop with good advice and quality mechanics.

The third item will make sure you get the first two right.