Autoweek is great. When I was in the States still, I got AutoWeek, Automobile, MotorTrend, and Car and Driver.
They all reported the exact same stuff, so if I had to do it again, I would likely just get AutoWeek and maybe Automobile.
Top Gear as a TV show is fantastic, never seen the mag, so I don't know if it is equally as good.
Looking forward to it coming back on BBC World.