I think there has been several discussions about this earlier already, but HotA barbarian and Impale DH might fit the bill. Also i believe there was some discussion of a meteor wizard, i have no idea what that build even is, but supposedly be one-shotting GR90's RG's, so it might do it as well?
FB channel meteor wizard - as long as it doesnt have to stop channeling, its damage is solid on ptr in both 1target and in aoe. situational, but an alternative option for GR 120 and below if it can sit and channel safely.
Shadow is a good alternative for GR 120 and below as RGK.
HotA would be something worthwhile trying, depending on how hard it hits compared to shadow at base damage and how well it stacks stricken.
Tragouls is as good of an option as it is on live.
Above GR 120, Boneringer inarius is quite a bit better than anything else. Rathma can copy the build piece for piece (archers rune not singu) and if it has enough essence can maintain a slightly higher multiplier and slot something instead of bone armor (if it doesnt have the essence to maintain 4 archers, then it won't work) but it loses stricken stacking during archer casts.
However, every meta changes when someone finds something new and better. This is just what seems to be in discussion.
it needs to be tested further, but a good choice that is known is firebats - helltooth has higher multiplier but arachyr does almost as much thanks to having an extra skill slot . speculative math shows that a well played aoe inarius poison scythe could possibly do even more damage and be far less laggy for the group - and with a stacking grouper support like zwizard and briggs znecro and harpoon zbarb, it gets area damage (its area damage isnt a radius, they have to be on the same unit).
however, due to massive buffs all around, could end up using 1 support comps and 2 mixed dps could do the job of aoe clear and enable many more options for meta comps.
depends on what the comp wants. zmonk gives grouping toughness and a some bonus damage, would just need a dps to do the scouting and prefers dpsers with 1-2 buffs to party damage like DH wolf companion as an example. if group wants globes, monk could cube solanium but zbarb and znecro do it better - but both of those sacrifice most or all grouping capability. there are plenty of options that benefit in different ways, zbarb will never be a bad choice as a scout and globe generator and zmonk will never be a bad choice.
every class has a viable support setup, but they all focus more on some of the following than all of it: grouping mobs, buffing damage, buffing toughness, poviding large amounts of cc, spawning globes, etc. most comps will need buffed toughness to really push far and grouping mobs is a huge help for aoe clears, so those tend to be favorites.
early in the season the meta will likely remain the current meta setup, but comps that dont follow this meta will be much stronger in the coming season than they currently are, expect gr 100 maybe as high as 120 to have plenty of variety. season 12 will definitely be the time to push with friends with builds you want to use most.