I have a dell dimension 4700 with integrated video and I want to install an accelerated graphics card to run the program Proshow Gold. (No gaming needed) My system documentation says I have 2 PCI card slots, 1 PCI Express X1 card connector, and 1 PCI Express x16 card connector. Can someone explain the difference between these types of connections and cards? Any specific card recommendations would be appreciated. I would like to stay in the $75 range - no more than $100 tops.