Hi there! I´m new here too, having bought GCII Ultimate Edition a couple of days ago (didn´t even try it yet, I want to finish my current Europa Universalis III playthrough first, but that´s a different story, lol!).
Great to see this game has such an active modding community! I don´t mean to hijack this thread, I came to look exactly for the same thing as the OP, that´s why I´m posting here. I´ll start with APT to get used to the game vanilla features, then I´ll begin to try a few other mods.
A little question, though. In every review I´ve read about GCII, the AI is highlighted as one of the best ever seen in a 4x game. With the problems TotA brought, is the AI still as top-notch as before? (obviously, after correcting the tech trees bugs).