Totem Arros and 40 watts.

Not the Arros, but I'm powering Sttafs with a TAD 60 amp set in Triode mode which is ~30 w/c. It's plenty of power.

My room is 12x12 though. In a room 15x20 the Arros will get lost unless you have a Sub.

i used a jolida 1301 hybrid integrated amp with the arros for a while and the combination worked well in my old 12 x 13 den. the prima luna would also be a good fit. i am using the jolida 1301 now to power a pair of totem taw 6.5 inwalls with a subwoofer in my new den. you would need a couple of good subs with the arros in a larger room.

Hmmmm.....
The Arros will go astonishingly deep for their size but I think they need a pretty robust, high current amp to do it. Of course, room acoustics will be a huge factor, too.