Huge Center Channel Hi Grade

You should really match your center channel to your mains, but if you want a big one, take a look at:

http://www.hometheaterhifi.com/center-channel-speakers/center-channel-speakers-reviews/a-secrets-speaker-review21.html

I agree to a point with Malcolm02 that you will probably get better timbre-matching by matching your center to your mains although his reference doesn't meet your specs.

Rather look to Jim Salk, Rick Craig (Selah Audio), or Peter Noerbaek (PNB Audio) to custom build you a speaker. You can specify whatever specs you desire and can afford and get furniture-grade cabinetry to boot.

I have a large center channel made by Magnepan.