I have 44K on my 2006 Sentra SE. I have done nothing but normal maintenance. No tires, brakes, anything. Serpentine belts are due for replacement but overall I am quite satisfied with the car. The lack of guts is due to the 1.8 instead of the 2.5. Unfortunately, I didn't have time to wait for a 2.5 to be ordered/delivered.
Body style, power window button location. Cup holders stink but otherwise the controls are ergonomic and the seats are comfortable.
Stiffer bushings. That soft rubber is scary! I prefer polyurethane, but a high durometer rubber on "all" models should be standard with poly optional. Turbo for the 1.8 or a V-6 should be optional as well.