Which of yours would you recommend for. 90% super, 10% sub use case scenario? Currently running a Resonator K which knocks the edge off for HD. However, I think it would be fun to have something better for fun subs on steel, possibly for HD too if it isn't too long or heavy.

Any of our 30 Cal models will do fine with supersonic.  If it's a semi auto, port noise will dominate with the longer cans, so 6.5-8" is more ideal