2008 Nissan Sentra 2.0 S 4dr Sedan (2.0L 4cyl CVT)
I will say that I looked at the Honda Civic and the Toyota Corolla. The Sentra was levels above on both. The Sentra with the CVT made the deal even better. Overall the Sentra had a great feel and value as well as great fuel economy.
CVT is amazing. The auxiliary port I love that being able to just connect my iPod. Also standard power windows and locks are nice. Not to mention the drive is very smooth and quiet.
Really, I wouldn't improve too much. Very well built vehicle and smooth to drive.