Good to see a few "Automobile" votes.... I used to work there, it's a great publication that doesn't get the credit that it deserves. Not surprised that the big 3 aren't so popular either, they all run the same stuff every month, no reason to get all 3 anymore.
Almost forgot, my favorites:
C&D/R&T/MT/Automobile/Autoweek/National Geographic/Eweek/PCMag
I worked in publishing for almost 10 years, i'm on so many comp lists that my bathroom is like the mag rack at Barnes and Noble.
2 jobs ago I put this little gem of a web portal together and re-designed the sites:
www.primediaautomotive.com