After nearly 8 years of obsessively playing SimCity 4, I need a new sandbox. SimCity 4 is fantastic, but I've pretty much exhausted my possibilities by now. I've also gotten bored with the iTouch version of the game. I like building things and watching them go, and then responding to the challenges the game throws at me. However, I am not into strategy/warfare games- I always find myself getting outraged at the computer players for attacking the cities I've so carefully built! The main consideration is that I'm on a Mac, so I can't play things like Cities XL. Any help? It doesn't necessarily have to be a city-building game, but I really like sandboxy game mechanics where the point is more just to play and build than to 'win.'