SET 845s are musical but also a little slow and rolled off sounding (from the ones I have tried or owned).
I have a 300B / 845 amp that I would love to get rid of but no one has a forklift to pick it up!
To the OP for SET in that wattage the 300B quartet in parallel single ended mode gets there. SET KT150s tend to sound more hifi / solid state but can produce the wattage. Closer to the KT88 push-pull tone.
Not sure about a SET with pre out for sub though. Icon Audio has a tape monitor circuit but not variable out pre.
https://iconaudio.com/stereo-300-mkii-300b-integrated-amplifier-stereo-300-mkii
https://iconaudio.com/stereo-30-se-single-ended-integrated-amplifier-stereo-30se
https://en.cayin.cn/features/8/57/73/369.html