+ Lots, this looks the best IMO. It breaks that area more into another room, and gives 2 rooms a tank view. Awesomeness.
I think the one with the couch against it looks better. It makes the room spacier and less furniture cluttered with the couch crunched next to the chairs.
Can you move the 120G 1 foot down? LOL. That way it is more in the room and there isn't a traffic bottleneck right where the new tank/couch would be.