Option 1 with Prime Pinnacles for mains. Unless you have lots of room to play with in order to get the Ultra Towers placed properly.
The Motion 40s during my audition were slightly anemic down low, but nothing like the B&W 600 series towers were. Either way, they were decent speakers, but a 3-way Center for me is near the top of the list.
That said, I don't think I've heard any complaint about the Ultra Center.