Infinity maybe
I have an Infinity Beta setup and the C360 center says its supposed to go from 45 to 20k (+/- 3db) according to Infinity's website. I dont know if thats what it really goes down to being that I've never tested it alone, and I dont know how much room acoustics will affect a center, but I like it and I can vouch that it definitely goes to at least 60.
EDIT: I didnt notice at first you are running some Primus speakers but not for your fronts so I dont know how well the C360 would match those fronts but it will probably sound fine with the Primus.
Vince