First things first: Chris, excellent news!

Glad to have you back for real (and with an MSN too!). I'll slot you in at the end of the first revolution, i.e. right after unkle and On Deck! If for some reason you think that's too early, just say so and I'll move you.
rolo, good point on not cutting corners. As for Shaka, we can't see if he has his hands full since we have no one we could potentially pit him against.
If we get the GLH then the cost of establishing new towns will drop significantly. With Colossus too, even more so. We should try to settle a few while we can still whip, to get a Granary and LH out early.
For IW, the only thing wrong with it is that I'd rather trade for it. Several AIs are bound to have it by now, if only we could meet them. MC is the tech I would have personally picked, both for the reasons already stated with Colossus, forges and Engineers, but also for the all-important Trireme. We can expect a lot of pirate galleys, and defending with galleys will not work long-term. Having a Trireme or two guarding our nets would mean a lot.
The fact that Dumbos require HBR make Construction a bit less attractive to me at this point. Only Axes and Cats won't conquer Shaka, and HBR is another tech I would rather trade for. So the answer to "when do we want to conquer Shaka" is likely "have patience" for now.
I'd like to bring yet another suggestion to the table, just to get it out there - Drama. Not for itself, but because I'm of a mind to bulb Philosophy with one of our GS that we'll get. Though IIRC in BtS a GS would favor Alphabet over Philosophy (checking - yes) so we'd need that too. Philosophy is a very nice tech to bulb for several reasons, assuming we can get it first. One, it gives us a religion, for happiness and the ability to run religion civics. Two, speaking of which, it gives us Pacifism, which we may not want to run immediately while Shaka is still alive, but we likely want it sooner rather than later. Three, AIs tend to downprioritize it a lot if the religion has already been taken. That means in particular that the later race for Liberalism will be a walk-over for us. Four, it gives us access to Angkor Wat, which would allow us to generate a few Great Prophets for the shrines the AIs won't build for us.