Wang Kon for early game, Pericles for mid and Peter for late, right?

Liz has to be in there somewhere!!

Hannible. The guy just rakes in the commerce, I've found he's awesome for teching into space, or funding a huge army, whichever floats your boat.

Pick any Financial civ and you won't go far wrong. Philosophical isn't bad either. Lizzy, Hannibal and Willam van Oranje are good candidates for a fast tech pace.

And Darius. He can run an insanely high science slider. Fin+Org.

Mansa Musa!!! Liz is a close 2nd based on my experience followed Wang kon and Willem van Oranje, Hannibal and then Qin, Ghandi, Justinian and the rest of Financial leaders.

If I were biologically capable, I would bear Willem van Oranje's children he's that good of a leader for teching...

All the good ones have Financial, Philosophical, or both. Many were mentioned above, but I am interested to see the reasoning behind Justinian...he doesn't have either good "tech" trait, or even a trait like Creative that gives cheap libraries. Does he just focus on technology in the game? Qin, the Chinese Emperor, has Protective and Industrious...those don't strike me as the choice traits for tech generation. Culture victory, though, is quite easy with China.

Mansa Musa, Elizabeth, and Washington were the kings in Vanilla, but I would vote for Washington again based on his traits: Charismatic and Expansive combined allow for huge cities that can generate a lot of trade revenue and commerce.

Wang Kon, Darius I, Elizabeth, Mansa Musa, Hannibal, Gandhi, van Oranje, are all Pericles solid bets. I'm sure I'm forgetting one or two good ones, and the number of leaders with either Financial or Philosophical traits numbers well over a dozen.