The problem with picking a bike for you is that being new to cycling, you may not know what you want. After you've ridden a while,you may find that what you are looking for may change.
I do think you are better off starting with an Endurance frame so I'd say the Defy, Domane, or Roubaix. Nothing wrong with Giant bikes IMHO. Ride them all, see what fits best. Ask if the dealer will include a custom fitting or any extras. You want to feel good about the dealer, so make that a part of your decision making.