Yeah I agree the G37 sedan would be the pick in my opinion, they are luxurious and don't compromise too much on performance for being a 4 door. And they aren't that terrible in mpg.
One of my buddys owns a last gen maxima as well, and he loves it, Ive bin it a couple times, defineltey not a 4 door sports car, but it gets the job done. (family sedan)
My pick would be between those two, but then again I am bias toward Nissan/Infiniti.
