Nissan meh... 
2006 Nissan Altima Sedan 2.5 S 4dr Sedan (2.5L 4cyl 4A)
Things to watch for....
 2006 Nissan Altima: automatic 48,000 miles. Gas mileage: 29 mpg highway.  It's only my second car ever had and I am so unhappy.  I find the transmission to be very harsh while shifting.  It's hard to drive the car smoothly.  The brakes constantly squeal and grab while driving at slow speeds even after I had them completely replaced.  My car also seems to need a wheel alignment every 1,000 miles.  Now I understand why the previous owner sold it.  I'm not sure how well it held up in the beginning of its life but at near 50,000 miles it seems like its about to just give up life.  My 1994 Mecury Sable with 100,000 miles, with a failing transmission, shifted more smoothly.  