xOrsizm: Sir: you have a good list.
Suggesting one over the other? not too good
What I see in your query:
1. 19mm twice
2. .40 one time
3. .45 two times
Break this down again:
1. 9mm Cheap to shoot not as Bulky
2. .40 good medium between 9-.45; Bulky
3. .45 more costly to shoot; Bulky
Broken down again: and why
1. Glock #1 most experience
2. XD #2 good experiences
3. HK #3 haven't ever been around one
#1 recommendation: 9mm affordable: plenty of practice
#2 recommendation: 9mm Glock 19 or G26
Now we are done with my thought.
YOUR Thoughts: MY view:
"you have picked the Best:"
Forget everything I've said::: Go to a GUN store::: place in your hands:
Each of the ones on your list. Don't RUSH: Spend some time
One will fill/fit better. That will be yours