If you do find yourself in need of a new PSU (power supply unit), look for what is called a modular unit. These don't have cables attached to them but instead you plug into it just the cables you need to avoid having that huge cable bundle with unused dangling all over the place restricting airflow etc.

The nVidia cards also tend to give you a crisper screen look where the fonts aren't overly soft edged and easier on the eyes.

Cheers