How much power do I really need for Totem Tribe Tower? LFD NCSE II, Sugden ANV-50 or?

Over the years I’ve had a number of Totem monitors and floor standers, as well as many others including Vandersteen 3A, Avalon Radian HC and Joseph Audio Perspective. But I now prefer smaller speakers. And I’ve owned a range of electronics, most recently Rogue M-180 monos (breat but too big and too hot) and, for a short time, a Lyngdorf TDAI-3400 (flat and lifeless - on a number of different speakers; just meh).

Earlier this year I picked up a used pair of Tribe Towers (89dB into 4 ohms), which I really, really love. They’re always musical, never fatiguing and have fantastic imaging and amazing bass in a small package. With them I’m currently running a PS Audio Directream DAC directly into PS Audio M700 monos. My room is pretty large at ~18’x20’. I’m looking to upgrade from the M700s. Budget is $4k max, used.

Totems have a reputation for really coming to life with powerful, high quality electronics. Manufacturer suggests min 50 w/ch. The M700s are fantastic for the money, easily drive the Tribe Towers and are never fatiguing. My Dad’s got a PS Audio BHK 250 amp that he’s going to be selling (and is in budget), so I gave it a try back to back with the M700s. Wow, the BHK is phenomenal, on a whole different level in every respect, not surprisingly, and a nice match for the TTs. My only misgiving is it’s BIG and HEAVY.

Dad also has a smaller secondary system with an LFD LE IV integrated (only 60 w/ch) so I tried it back to back with the M700s. The LFD is more musical, images better and has a deeper soundstage. On the downside, bass isn’t quite as deep or well controlled and it was a bit too forward, for me a no go.

Think I’d like to keep it simple and stick with a solid state or hybrid amp or integrated, preferably <10 years old. The LFD NCSE II and Sugden ANV-50 are appealing and within budget used but I’m concerned they won’t have enough juice given the size of my room. Ditto for Luxman integrateds. Also thinking about a more powerful Rogue Medusa hybrid amp, an older BAT VK-3000se hybrid integrated, Coda Csib and others.

Thoughts?