Archimonde is one of worst torsos right now. Brutality is much better. For 12 points of weight you get about 100 heat, 25 cooling and 25 energy.
Torsos are one of the easiest parts to objectively evaluate.
If you have no mythical plates, Avenger and Brutality are the best cores.
If you have mythical plates, Brutality, Windigo, Nightmare, Naga and Grim Reaper are all good, depending on your weapon set up.