I'm around lvl 120 atm. I personally am aiming to get the remaining two deco's after I can level the girls ~20k times in a run (without slowing down). Reason being, I will then be able to put some into those useless deco's once in a blue moon for the prestige boost (even if it's only... what.... 100 per deco level on them). Would be nice to have a calculator that determines what level all other deco's should be based on your favorite girl multi deco's you are using.