Hi, I just bought the 24 inch 2.8 iMac with the upgraded nvidia graphics card. I have received varying views about replacing the current 2gb of RAM with 4gb. I only really play WoW in addition to my graphics work and some people have said neither of these two tasks should utilize more than 2gb of RAM. I am still new to computers and was trying to figure out whether or not the upgrade is worth the cost. Any thoughts?