I could probably get that, are you sure it would work with the rest of my system?
If your current power supply is a standard atx power supply then any standard atx power supply will fit.
The psu you choose will be based on the graphics card you choose.
Personally if I were you I would first upgrade my monitor. If your still using a monitor thats 1280x1024, a new graphics card would just be a waste imo.