@jedog: Yeah I know its not a great list I could only think of these characters at the time I made this. I was just trying to give people some options on tkers, and not what I thought the very top contenders would be; it's just a mixture of everybody. Some of them are just outliers like Hector Hammond and Justice and I put other just in case I missed any one super powerful.
@darthmummy: I see what you're saying any one with tk abilities regardless of origin or source of the ability is considered as having tk. So maybe I should restate the question given that I am only looking for characters who are below cosmic beings like the Phoenix, Galactus, Living Tribunal, or The One Above All.
@havenless: Yeah Stryfe is crazy powerful I was going to put him in the poll but seeing as the op specified strongest versions I am pretty sure that puts Cable on Stryfes level. Cable was at his strongest when the techno virus was gone and he was fighting the Silver Surfer.
My vote goes for Jean and Nate Grey seeing as they are really the only people I can think of that are crazy powerful with using their TK and have some of the best feats out there. Of those two who is the strongest would probably be Jean seeing as she has the experience and skill to beat out Nate's raw power.