um, please let us know what you need a new graphics card for, essentially:
1. what monitor resolution you'll be using
2. if multiple monitors, how many?
3. what you'll be using it for? assuming gaming, what type of games?
4. if for gaming, do you absolutely have to have all the graphic settings maxed out? or are you ok with medium settings?
5. what power supply unit do you have?
6. how much are you willing to spend?
with the above information, we'll be better able to narrow down your options and ultimately help you choose the best card that's for you