I love Simcity 2000 and 3000. I also have and enjoy Cities XL 20xx (I can't remember the year that I own). I feel Cities XL picks up where sim city dropped the ball :/

I was not a huge fan of Simcity 4 however. I just couldn't get into it.

Although one of my favorite things to do is go into sandbox mode and just build some stuff. I made a city whose border is surrounded by nothing but statues of me...the mayor! Once you get in...there is no escape! I like to use it to do dumb social experiments like this. No cops, 30 prisons =D

This is probably why I like Simcities Societies but no one else did :/