This is a theorycraft build using 5pc DMO and 2pc Capt Crimson with RoRG. I have not had the chance to try it due to gear not having correct rolls, however; the idea is to use DMO set to boost your only damaging spell, Frozen Orb. As long as you do not outpace you resource regeneration it should be basically spammable. With RCR, CHC, APoC , and Solanium/Burst of Wrath in the Cube + Reaper's Wraps your resource should be plentiful. Cubed armor can be anything, but Frostburn seems like the best choice. If you prioritize RCR and CHC you should be fairly close to 50% on both, after Paragon and Gems, even with bare minimum rolls, with the max being around 60 percent.
Regarding the Cubed weapon, I am not sure which would work best between Solanium and Burst of Wrath, but I am going to try Solanium first.
Tell me what you think and if you had a chance to try it.