Makoto Shishio vs. Rock Lee
Chunin Exams Lee. He can take the weights off if necessary.
I know a lot of people will harp on about Lee's speed but at this point, what are his best reflex feats? Shishio was around Kenshin's equal or perhaps superior in the speed department and Kenshin has:
-deflect a bullet
-run straight at a gattling gun while it was firing on him and evading every bullet
-cut cannonballs being fired at him before they can hit him
Good reflex feats I'd say.
In the power department, Shishio effortlessly caught and mangled a punch from Sanosuke Sagara...a guy who can do this:
YouTube video
He then withstood another punch and Futae no Kiwami to the face with no damage.
Even Kenshin's absolute strongest attack didn't keep him down for long and his body temperature was also going high so he was hurt even more.
Hell, the guy fought while his very life source was vaporizing.
I think this be a good fight.