I don't have a center channel yet, but for a large room like mine (23x20) VP150 is suggested. Probably for your room vp100 would be OK. Others with Center experience will probably chime in soon.

Axiom M60s, QS4s, VP100 Onkyo TX-SR804 Oppo 970HD Rotel RB-1080/RCD-1072 REL Q150E sub, PS 3