I agree with Bill. Choose the amp that works best with your speakers. I believe every component you've mentioned offers an audition policy with a return option. Yes, it may involve shipping or even a modest restock fee, but this is far cheaper than making the wrong decision. In the end, no one here can tell you what to buy. I can truthfully tell you I've had a Schitt Freya+ for a few years and I really enjoy it. Just drop in some NOS or ANOS 6SN7's and you're good to go. But I'm not about to tell you to buy it over the Schiit Kara. That's something you'd have to decide thru an audition.