I just went through this myself although my addition is not a basement addition. I had planned to only install one window for egress, but after looking at the draft plans for the addition, it was clear that the house would not look aesthetically pleasing from the outside without more windows. My home has a fair number of windows and to essentially build a box on the home without windows just wouldn't look right in my case.
So, I chose to include windows as if I weren't building a theater and do the best I can to cover and isolate them. This seems to defeat the point of having windows, but in my case it provides improved aesthetics from the exterior, which is very important to me.
FWIW, I do tend to worry about whether the windows will rattle, how it will look when they are covered with MDF, etc. Only time will tell.