I subscribe to MotorTrend and AutoWeek. I have to say that Auto Week is my favorite. I really like their articles and they seem to have the best scoop on car news and rumors. The only things I don't like about AW are the ads in the back and all that racing news since I don't follow the sport. It is kinda cool to read the ads though. I get to see what the cars I'll NEVER own cost.
I also enjoy the Dupont Registry and Car and Driver at times.