a naive question about HT speakers

I'm on Audiogon for the two-channel audio discussions, not home theater, and I apologize upfront for this somewhat slacker thread. I've got a decent television (LG OLED 55") and I've been using an old Yamaha soundbar with a Yamaha subwoofer. It's fine. It's a small room and not one that could easily take a 5.1 sound system or anything beyond that, but I'm considering putting together a budget 3.1 system, just to see what it's like. I've got a pair of PSB Imagine Minis that are sitting idle and would fit in the room, and I was thinking of picking up a center channel speaker and a receiver. 

I don't know much about how these things work. I can see that PSB makes an Alpha C10 for about $350. I also see plenty of positive reviews for center channel speakers by Klipsch and Elac that cost less and get good reviews. Does anyone know if the PSB would play nicer with the Minis, or whether that doesn't matter at all? 

I should add this is just for movies, not music. And this is just for fun so I'm not going to think about different L/R speakers, a new sub, satellites, etc.

Thanks!