Hello so I'm upgrading a Desktop PC I got from my cousin, as my laptop is slowly dying. It's a Dell Dimension 5100 with less than 1gb RAM. I'm upgrading to 4GB RAM since I found a good deal. I want to play Starcraft 2 and use some music producing programs, so my question is... what kind of Graphics Card and/or Motherboard would work with it, or do I even need to purchase a Motherboard??? also is there anything else you think I should upgrade? Thank you for your time !