These bikes are basically flat bar road bikes. For example, the tires are skinnier on the FX 7.6 than on the 7.3. Instead of triple chain rings the Trek and the Specialized have compact doubles. The Cannondale has a triple. The geometry of these three bikes differ somewhat. So, you will have to see what feels better to you. Even if you cant try out the higher end bikes you can compare the geometry by trying out the lower end bikes.
I have a lower end Quick, from a different line, that has a triple chain ring with mountain gearing and bigger tires than a flat bar road bike. I also have a Trek Madone, a carbon road bike with drop bars. Each has their benefits. For commuting I would prefer the upright Quick. For riding long distances the drop bar, light weight, skinny tire bike is better. The Quick is better on very steep hills with its mountain gearing and triple chain ring. The Madone is fine on rolling hills but if I was biking where there were more extreme hills I would want some lower gearing.
People talk about the advantages of drop bars for the increased number of hand positions. They have something of a point and you can get more aerodynamic on the drop bars. You can also ride with your hands on the hoods or on the top, giving you alternative positions. That said, this arthritic woman finds flat bars more comfortable provided that I have ergonomic grips on them. Depending on how my arthritis goes I may end up with a flat bar road bike, like the Vita Limited (the carbon version of the Vita).
FWIW
Trek Madone 4.7 WSD
Cannondale Quick4
1969 Schwinn Collegiate, original owner
Terry Classic
Richard Feynman: “The first principle is that you must not fool yourself and you are the easiest person to fool.”