I don't know if I asked this before, or not...
I'm curious if there are certain spots on certain trees that you always consider the overall best choice - and stop there.
For instance - I know that most people say to never go past the first Farm upgrade... Are there others?
And are there certain ones you want to get as fast as you can and build? Like Stock Exchanges? I actually tend to go for those really quickly, but I don't know if it's really worth it.