well the reason i rate the haitian so high up there is mainly because not only can he supress the abilities of any evolved human near him, but also mess around with their minds, which nobody that we so far know has a defence against, and the online graphic novel it takes a village reveals that he can actually use his power on multiple targets at once without the need to even be touching them
hiro and [future] peter both have amazing control over their ability to freeze time, which pretty much nobody (apart from the haitian) can stand up against, and teleportation is also a pretty badass power, and peter having a bunch of other powers as well would naturally be higher
eden can control anybody (again, apart from the haitian) with just the use of her voice which puts her right at the top
imho, not any incarnation of sylar would realistically be able to stand up to any of the above, however due to all of his other powers as well as his incredible mastery of them hes easily above anybody else
candice's ability of creating illusions is another pretty uber ability. having the ability to control what her opponents can see would be a b1tch to go up against in a combat situation
nathan's ability to fly would seemingly not appear to be too impressive, however the speed at which he can fly (supersonic) would make him an extremely dangerous enemy combatant
the department of the defence agent from the dark future seen in the online graphic novels walls is fast enough to run across walls and dodge flame attacks coming from future peter, so she would rank pretty high up there in terms of power imo
claude can turn invisible, which would pretty much only give peter, sylar, dale smither, and people with thermal scanners the ability to detect him
DL can phase, enough said. oh and hes black too...
coming to think about it id probs put DL one space higher and replace claude with the DHS agent from the future that can control electromagnetism and levitate, or perhaps nikki