@Mangist, it wasn’t too painful, surprisingly! It was actually pretty funny in a weird way. As @mrdecibel notes, his Klipsch sounded very nice with the Marantz, so I’d go there first. I can’t speak to the others as I’ve not heard them, although I had an Adcom amp for a while and I thought it was too forward with the Klipsch.
I’ve run my Forte on a 3-5 watt SET and it was plenty loud. I’d try the Marantz and Kenwood first. I cannot emphasize this enough however, the Chorus and a rebuilt Scott, or perhaps a Fisher, will give you a gorgeous synergy.
I have a NOSValves Scott 299b and the Forte I. I’ve had a LOT of gear, much of which was excellent with the Forte, but the Scott always finds it way back. It bested, in a photo-finish, a beautifully rebuilt Sansui AU-717. The Bob Latino Dynaco ST-70 was beautiful with them, but ran very hot in summer. Sansui 881 was very good, Luxman R-1120, etc.
The Scott’s lush tubes and the Klipsch dynamics somehow work beautifully together. I temporarily pulled the Scott and I’m using nothing more than a little Tandberg TR1020-also a very nice combination.
So, with my Forte, I’ve settled on Scott, Tandberg, and occasionally my Fisher 500c.
Trust me, Scott and Chorus, you won’t be sorry. I’d consider letting go of a couple of pieces and Scott shopping.