Given your requirement for tube-like warmth, I'd say the Rowland is probably the front-runner from your list. Timo's characterization of the JC-1 fits my experience as a dealer for that amp, so much as I like it, I don't think it would best meet your stated needs.
Other "warm sounding" high performance solid-state amps include Accuphase, Warner Imaging, and GamuT (I've owned all three, and sell the latter).
Best of luck with your amplifier quest!
Duke
Other "warm sounding" high performance solid-state amps include Accuphase, Warner Imaging, and GamuT (I've owned all three, and sell the latter).
Best of luck with your amplifier quest!
Duke