Here is a save game which lets you choose your first culture. I've been lucky with science but there is only two units. You may spend one or two turns to gather some food but i've decided to start straight from it.

Nomadic Tribe Turn 10ERA1.ctr

Difficulty : Empire

Timer : Slow

Standard AIs :

Elissa = Orange

Lucy = Magenta (She's the first every time)

Boudicca = Lemon green

Agamemnon = Dark

Beowulf = Brown

Walinong Sari = Blue

Makeda = Yellow

Ancestor = Pink

Tjilbruke = Something like green

Let's play until the turn 50 :

First run with the Olmecs, they suck.

Second run with Babylon, not bad.

Third run with the Harrapan, Golden!

I've not tested the others cultures yet but i'm pretty sure the Harrapan is overpowered.  

If some of you are interested to test let's share your thought!