I'm at a lost on selecting a center channel to finish the system. My L&R are Sierra 2 with HTM all around. I have a fire place with a 92" motorized screen that comes down above the fire place. At the moment I mounted a paradigms bookshelf above the screen ceiling mounted.

The paradigms sound okay but I want the fronts to match. My choices are to stay with Sierra 2 or go with a Duo. Placment would be where the paradigms is. Seating distance is around 13-15ft angled towards the listing postion. Ill try to post pictures for a better understanding and ideas.

System
Fronts L&R:Sierra S2
Center:Paradigm Atom? X 1
Sounds:HTM-200se x 2
Atmos:HTM-200 x 4
Sub:Svs PB-2000
Layout:5.1.4

Marantz:SR6014
Xbox one
Panasonic blu-ray