I wonder why you haven't switched to OR civic since you already have switched to Jud religion???
Yeah, that occurred to me after I posted the game last night and took the dog for a walk. "Crap. Did I change civics?" Insert forehead slap here. I'll switch to OR first thing in the next round.
As with the previous round--heck, as with every game--there appear to be two prevailing schools of thought.
On the one hand, I should REX peacefully while teching towards the military capabilities (Catapults and Crossbowmen) needed to take down my neighbours.
On the other hand, I should take down Joao NOW when he's weak, before he gets Longbowmen. No, Longbowmen aren't invincible, but they are a pain and it's always nice to avoid them.
There are concerns about the economy as well, especially what a lot of expansion will do to it. And then there's the quest to worry about.
I think a hybrid approach may work best. The main goal of expansion at this point would be to ensure that I get the land I want so my neighbours don't. The most obvious solution is to settle the blue city site (fish/gems/copper) as soon as possible. With that city in place and no open borders, both Augustus and Joao are blocked from expanding by either land or sea until Caravels for Joao (he won't live long enough to build one, trust me) and Galleons for Augustus (ditto). Blue city, with the gems, will quickly be able to pay for itself for some time, so its impact on the economy will be less than any other city.
Blue city, then, would buy me some time to build the other cities at my leisure. Which means I could then have time to devote towards units that could take down Joao. I'll send a Chariot into his territory quickly to verify he has no metal, then close borders again.
Can anyone calculate how long before Augustus gets his Great Spy? And will the AI use the GSpy for infiltration? From what I've seen, the BtS AI prefers to use the GW GSpy for other uses, including--

--a golden age. Should I wait and see what Augustus does before investing a bunch of hammers in Spies I may never use?