I don't have that center, but the center does a lot of work on movies, and matching the L/R is very helpful to keep an immersive image as sounds move across the screen. If your old speaker has a good sound, you don't have to change it. But I can't say how well it matches your L/R. If money is tight, I would get the other stuff first. If not - as is the Axiom way - give it a try.

Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire