Trystero
Deity
I share ParadigmShifter's concern here: I would be hesitant to trade Aesthetics to Industrious AIs while we are trying to build Aesthetics wonders. At least until we have a head start on the Parthenon.
I vote that Earthling trade Currency to Churchill for 40 and report back on whether Churchill will then be willing to trade us Math.
I'm skeptical that we'll get Math in trade, so I'd prefer to wait until Parthenon is near complete then trade Aesthetics for cheap, if need be, to get a diplomacy bonus. I'm not crazy about the idea of giving up two of Aesthetics/Currency/CoL for Math and a diplo bonus.
So I'll vote for safe, largely because I don't think we'll get the trade we want.
I'm not overly averse to trading aesthetics now, but would prefer to leave it a few turns. I think Gandhi will beat us to the Parthenon anyway.