Hi Mac,
I demoed the Harbeths with a Croft Phono Inegrated. Obviously it was good enough with the P3's that I bought the speakers. Sounds very good together. If my memory serves me right I'd say that the added power controlled the P3's a little better than my Sugden does. Sound quality wise, overall, I think the two are pretty equal though. The Croft is a little smoother and drives the P3's better. The Sugden is a little clearer and slightly more detalted. So it could just be a sideways move. Unless, I go for the pre/power combo from Croft? Not sure how much better that is than the Croft integrated?
I've lisented to a few of the other amps everyone has listed here, but not with the Harbeth's. The Primare is not my cup of tea. It sounds like Class D always sounds to me. It's too bright, clean, and has this greyish flat quality about it where the tonal colors seemed washed out a bit. The Rogue Sphinx has this same quality. I much prefered the older Primare I21. Just my take, I know many of you like it.
Iv'e owned Luxman, it's great in many respects, but was too bright for me as well. Accuphase might be a little warmer sounding but never heard one. No dealers here for them. I heard the Pathos and it's a great amp, but not sure it's the right match with the Harbeths. I rather team up the Pathos with some Italian Opera or Sonus Faber speakers. I heard the Hegal H80 two times. Once with B&W speaker and it sounded really, really good. Then heard the Hegal once again with Proacs and it sounded way too bright. So I don't know about it.
My hunch tells me that I'd like the Heed Obelisk/X2 combination or the Sonneteer Orton. However, it's a gamble as I never heard them. I'm just going by the reviewers. Another one on that same list is the Belles Aria integrated amp. It's supposed to have a nice warm tube like sound.
I guess that leaves me with the Sugden and the Croft as the only two amps I have heard with the Harbeths. Everything else will be a gamble. I could upgrade to the Sugden A21SE or go for the Croft pre/combo. Or I could take that chance... Is it gambling season?