In all fairness, the HA5000 may be designed to pair with ATs, but there have been positive impressions of it coupled with other brands of headphones. I found it to be comparable to other amps in the $1,000 to $1,500 price range. I fully agree that at double the price the Anniversary version is hard to justify though. I think other amps in the $3,000 range would best it hands down.
As for the Luxman, perhaps "warm" isn't the best term, but I find it to have a liquid or "wet" sound for a solid state amp. I think it's more stereotypically tube-like than the Zana Deux, which sounds about as solid state as a tube amp gets. Out of curiosity, why would you suggest not bothering with the P-200? I've never listened to one.