PoE Heart of Thunder, Orb builds

So I was thinking of league starting as Righteous Fire. The new masteries makes leveling a breeze, but how realistic do you think it is to migrate to this after a week or two? Are these clusters really expensive? I'm a HC player who just farms red maps...so this seems pretty cool to me to be able to play that Auto Bomb style while remaining semi tanky. Thoughts?

I just wanted to post about my build idea and tested since I think its really cool. I've tested Hydrosphere with spell echo and can confirm that the final repeat does have a 100% crit chance and when using it with greater spell echo it also inherits the extra aoe and more damage multiplier. Scion Archmage: This is a (not that good) pob for an archmage scion that I used the interaction with. I stacked cast speed to make the build be able to clear maps a bit more smoothly but its strength is definitely in bossing. I defensive laye