We just got a Graco Quattro Duo based on a friend's recommendation, the back seat for the little one (which reclines fully), the front seat for the big sis. It's kind of a jump seat so she can hop in and out of it easily. It's only a wheel length longer than the regular Graco Quattro when it's folded down--but "taller" when folded down due to the second seat. The friend who recommended it is a "stroller queen" she had two bugaboos and several others before buying a double...
My only downside is it's heavy--but you said that doesn't matter. It pushes very easily and has a large basket underneath that has a handle on the rear of the basket that collapses so you can get in the basket easily.
Seats aren't "moveable" or "rearrangeable", but when we were researching, we kind of figured that we'd find the arrangement we liked and it would just stay that way.
I think the seats facing each other is going to be a hard one for you, the Options seemed to be one of the very few that had that when we were researching. I was very interested in that one as well, but after researching a bunch, it seemed there were a lot of people who were not impressed with theirs.
Good Luck finding the perfect stroller!