Alex 
2006 Nissan Altima Sedan 3.5 SL 4dr Sedan (3.5L 6cyl 5A)
Reliable and fun to drive
 I just bought one with 46k miles on it.  I was happy to find that it still has plenty of power.  I took it on a 7 hour road trip and enjoyed how easily I could pass other cars on the highway.  It also gets pretty decent gas mileage for the size of the engine.  The handling could be better, it feels heavy in turns.  A little disappointed with the sound system.  Overall a comfortable and capable vehicle.    