I used to own an X-Voce & got rid of it because it didn't blend well w/ my av123 elt525 smaller tower speakers (which had a weak center channel even after skiing ninja upgrades). Plus that X-Voce is huge.

I later owned GR Research N2x's & ugraded to N3 transmission lines. The B & G planar tweeters coupled with the clean midrange/ bass from Danny's superb higher end crossover design allows 2 channel system to sound better to me for movies & tv than my previous 3 channel front end ever did. The center channel is 85% dialogue anyways, so 2 channel stereo serves that purpose well. I enjoyed 5.1 & 6.1 HT, but prefer the cleaner 2 ch sound in all honesty.
But since you own the X-Omnis, the X-Voce is likely a better match. The X-Voce will blend better w/ your mains & be more seamless as drivers, networks, etc. came from the same speaker line.