I know you want high Sci. But we also have to consider the cashrushing of airports, barracks, temples and library's (and perhaps more) in Persia, Zululand and Azteca. Our current treasury is 4149 gold. That is definately not enough.
Simply put: how high do you want it ?
Sci 100%: Radio in 4, -413 gpt.
Sci 90%: Radio in 4, -260 gpt.
Sci 80%: Radio in 5, -86 gpt.
Sci 70%: Radio in 6, +91 gpt.
Sci 60&: Radio in 6, +263 gpt.
Sci 50%: Radio in 7, +414 gpt.
The rest of the options do not strike me as High-Sci".
Simply put: how high do you want it ?
Sci 100%: Radio in 4, -413 gpt.
Sci 90%: Radio in 4, -260 gpt.
Sci 80%: Radio in 5, -86 gpt.
Sci 70%: Radio in 6, +91 gpt.
Sci 60&: Radio in 6, +263 gpt.
Sci 50%: Radio in 7, +414 gpt.
The rest of the options do not strike me as High-Sci".