Well, Kitten already knows this, but my vote is for Railroad Tycoon. That game has it all, building things, ruthless business tactics, a dynamic stock exchange, ruthless business tactics... I mean, the games not for everybody. Stock manipulation in 19th century industrial transport enterprises may not sound like a good time to everyone. That's why Roller Coaster Tycoon is so successful. Everybody loves theme parks. And perhaps if they could figure out a really good way to have your parks in Roller Coaster Tycoon compete with other parks, I might promote it to best sim ever, but for now if you want the best you have to ride the rails.