Ramses or Darius for a leader, long time we haven't played them.
Darius is one of my favorites civilization, Org/Fin is so powerful for huge empires.
Its UB is okay and its UU is great for warring in early BC.
For Ramses (Ind/Spi), I can't remember when it was the last time I played with him.
Could be interesting to play a more diplomatic game, or a wonder-spam one.
my 2 cents.