I remember two comics which i brought in my childhood. They were:
I liked Man Of Steel #1. It seemed really special. But weird thing is that i did not know that this was supposed to be the first in a miniseries. It reads as a self contained issue.
The other one is weird. Kingdom Come #4. I was a fan of Justice League from the cartoons. I looked at this and was impressed by the art. I got it. But couldn't understand most of it. The issue was a good read even with less understanding.
Your office space sounds cool. I think Superman is someone special. Comic book nerds always go about Batman or Wolverine and heroes like that but the general public has a lot of love for Superman. Superman is thus in a different class in my opinion. Superman appeals to everyone. Even if a person won't read one book he appeals to them like no other.