Question 1 - I would say is covered with the suggestion above.
Question 2 - very personal, I would suggest. I use a wide ranger, with active helper woofer. The wide ranger is modded with a phase plug that in my experience helps with beaming. I am aware that I am giving up some of the top end, and have explored ways to address with with a tweeter, but have not pulled the trigger.
Question 3 - I use the Visaton b200, but there are tons of choices out there, and lots of ways to implement.
Lots to learn, keep asking, and keep in mind that much of the data out there is subjective- though there are examples of measured curves etc.