You have some interesting choices listed.
From where you are, warm sounding but plenty of bass I'd think you'd want something maybe a little livelier while keeping the robust nature.
Pass is to me a very personal choice. Fanboys claim it's the end all to everyone, but to me it's a hazy IPA or a sour beer. You really need to listen to it yourself and you'll love it or not. Definitely not an amp I'd buy based on other's recommendations, even mine. :D
I've heard Luxman SS with Harbeths and they work really well together, I'm also a fan of the little Rogue tube integrateds. Not sure how the Luxman tube would work, kind of be tempted to keep it in rotation. That is, if you can afford to, keep your PS Audio and add the Luxman tube.
Another interesting sounding amp for you would be Ayre.