... I think cheaper buildings are a bad strategic move [for high scoring] - if you know how to make money in Tropico, you'll always have enough dough anyway, and if you don't you'll lose anyway.
I doubt that there is any secret key to knowing or not knowing how to make money. Of course, I also have no use for striving over scores.
In any case, it is important to remember that the developers deliberately tried to make every decision have both an up side and a down side. If you maximize your Swiss account and score with the Special Building Permit, you reduce the money available for buildings which reduces the score for treasury and buildings. So, a great deal of trying to plan "strategicly" consists of splitting hairs because both sides of a decision are not always apparent.