While I haven't heard the A/V-O's, I own a pair of Ninja modded X-Omni's and a pair of O-3's, so I can comment on them. Simply put, while the Omni's are a terrific speaker, and probably the best budget speaker I've heard, they aren't in the same league as the O-3's. Both can throw a huge soundstage that is layered and deep (as long as you can get them away from the walls). However, while I really enjoyed the sound of the Omni's, even with Sonicap Platinums as bypasses, the sound was a bit more diffuse than what I would like. So, as long as you're looking primarily for soundstaging the Omni's are amazing, and that's why they are the ideal surround speaker in my mind. On the other hand, the O-3's do not run into this problem. They can be sharp, crisp, and pinpoint when needed. Perhaps not quite to the same level as the N2X's, but they retain the soundstaging that the Omni's have. So, to me at least, the O-3's are speakers that balances all of the features I'm looking for in a speaker and is one that I can live w/ for a long time.
