When buying a video card for my comp what are the most important things & specs I should look at besides price

What should I look at core clock, memory clock, memory amount what? Oh and what do I need to be able to run high level 3d games.|||http://www23.tomshardware.com/graphics.h…



The above link is a visual representation comparing "video card" performance.|||weather or not it will work with your mother board.