im not gonna spam on u, so ill give u two important ones, or ones that i know u wont do anyhow. sarasu taalon, for one. both his previous state, and post pool of knowledge. stronger than luke, and faster as well, he also knows almost... well, everything, post pool of knowledge lol joruus c'baoth is the other one. the guy is like, a monster. his jedi self (the original) was already a beast based of off hype and shit (comparable, but weaker than dooku for sure), while his clone, with all his previous memories (except his jedi training, so he had to 'start over' with the dark side), and some dark side training is literally as strong as vader and cronal. could fight luke a year before dark empire, and was winning most of the time.
ps, important, please tell me who ur already gonna do, so i can know whom to tell u, and if u got discord or something, tell me