Casino tycoon was too easy.
New York Tycoon wasn't bad for a while, got too repetitive. Nothing beats the original Transport Tycoon [Deluxe] - do a search for OpenTTD adds a bunch of features to the old Transport Tycoon Deluxe, also has online multiplayer etc. Rollercoaster Tycoon was the only other decent tycoon game out there... was also made by Sawyer, go figure.
