Elear,
Have you actually built the Manhattan Project in a 20k game? I can't say I remember doing such. Oftentimes, I barely make it to the modern ages in a 20k game, if at all. And it gives you what 2 culture per turn for 800 shields? Granted it's something, but I can't see it as all too useful in a 20k game of any sort. I say that if your research outstrips your culture and you easily make it the modern ages build Longevity and Cure for Cancer instead (or first). I agree the other ones you mentioned sound pretty good for a 20k game.
Maybe a bit off topic.... but why do a lot of you say that Uni Suffrage is a bad Wonder?
Less WW in Republic or Demo means less on the happiness slider which means more gold right???
Anything i'm missing (or did Uni Suffrage change alot in C3C?)
Greate Lib useless at Monarch and below, but like "a must" at Sid
With the exception of 20Ks:
4. All modern age wonders except SETI (and even SETI is still a bit weak)
maybe so. I'm referring to vanilla though, so no internets. Sorry, Al Gore.
Shaka says: Once you go Conquests, you never go back.