I have used a 400 watt load for my 68 plexi and ran just about very kind of amp as a power amp. Marshall Superlead into the low bright input, worked great, Musicman HD130 works great, Fender Bandmaster works great, Tubeworks Mosvalve MV962 works ok, was kind of weak on the low end, Peavey Classic 50/50 el84 tube power amp works great and has a depth resonance knobs for more low end at lower volumes,

, Matrix GT1000FX, works great low end could be more but it does punch well. The tube amps maybe had a little more compression over the solid state but it's not horrible and you might actually prefer the tube power amps so don't count them out.
If Suhr's reactive load was more wattage I probably would pick one up, John Suhr knows his shit, I still use my Suhr iso line outs but Al uses his 100 watt SL into the Suhr RL with no issues so my concerns may be unwarranted.
I think Kapo Polenton with get good results using the Torpedo as a load and then tapping the line level signal with the Suhr Iso line out to feed the return of the Metro loop on his 50 watt Marshall to drive his cabinets, he can also run an attenuator on the slave amp and cut -4 to -8 DB without squashing the tone and he can always add a depth mod to the slave amp to increase the low end punch when he plays at really low volumes.
Let us know how things go with the slaving setup Kapo, I think you will get good results since you have most of the gear already to try it out.