I owned a Beta that I didn't think was up to others I've heard at meets. Afraid I never had very detailed specs on it, so difficult to recommend parts.
And the Luxman was loaned to Voltron from Todd and showed up to a Marin meet. Voltron would be good to get greater feedback on it (he's obviously caught in it's power as he's looking at buying). It was an addicting sound I've thought about often, but especially since the HD800 was annouced. Fast, but polite, somewhat like 'stats with the variety of phones at the meet (K701, CD3k and even HD650). If the Beta screams power, the Luxman is the opposite. Reserved. Maybe perfect. Would only know with more time.
Voltron would be a good source on the B22 variations also as he acquired one soon after hearing mine and commented on how much better it was.