We definitely need 2 Great Scientists if we want Astro. Each Great Scientist is at least 1500, and Astro is a hard 3000 that gets no benefits from prereq multipliers. A 3rd Great Scientist to bulb 950 Optics would also be helpful even if a bit of a waste. Definitely need 1 Great Artist, and 1 more Great Spy would be extremely helpful. Even a Great Prophet from our capital would be useful to make another Shrine for 4 more points. I hate building Mausoleum for just 1 Golden Age, but again, it is 4 more points. We have enough very large cities to make a pile of Great Scientist/Great Artists/Great Merchants as long as we run Caste+Pacifism during a Golden Age. Have Beijing build a Monastery to spam Tao Missionaries eventually? It is +1 per turn and all our Great People cities will need religion.