What resolution is your monitor?
Secondary Question #1:
What Power Supply do you have?
Secondary Question #2:
What do you want to play/do with this video card?
Secondary Question #3:
What CPU do you have? (this goes toward whether it'll keep up with a particular video card)
Secondary Question #4:
What is your budget?
BTW: Your motherboard supports the PCI-E graphics card slot. Beyond that, it really has little meaning as to what video card you should get.
The above questions are really what need to be answered so we can properly recommend anything to you.