Since it was not mentioned in the posts, I wish to alert you to the fact that there are different DVI cables - your choice being dictated by the ports on both your monitor and gfx card.
Given you unfamiliarity with DVI, you might consider this brief article
which discusses the options and gives you clear images which will help in identifying the ports on your components. Both your monitor and gfx card support DVI-D; whether it's single or dual link I was not able to immediately determine.
As a general rule, I should think you would choose cables to take advantage of your component's greatest capability/flexibility.