Look terrific, and I'm sure that they sound terrific too.
As for a center, you build a center channel version of the N3, which should more than do the trick. The Voce just isn't in the same league as the N3's, as I discovered when I swapped in the O-3's for the Ninja modded X-Omni's. Though, it's also possible that soundstage wise, the Voce doesn't match well w/ the N3's, since it is OB and a different type of sound.
Either way, congrats.