Schitt Mjolnir ($1199)
I was planning on getting a First Watt to use with the Mjolnir but wanted to try the Schitt Aegir first (also Class A). The Aegir was a great match with the Class A Mjolnir. The First Watt is reviewed to be a bit better but I like what I have.
I use this for my RAAL SR1a phones but have used the Mjolnir with the Sanders Magtech on my office Magnepan LRS+ speakers. It was a fun listen. Not as clean as the Holo Serene preamp, but almost nothing else is.
I will be pairing the Mjolnir with a CODA #16 amp in my office this weekend for what I expect is another fun listen.