Well, your motherboard only has two PCI slots and 1 PCI-E x1 slot, which is kind of peculiar and will make shopping for a video card difficult. Modern-day video cards use a PCI-E x16 slot, which is a longer variant.
With the PSU that has been put in your PC, you can't go too heavy-duty with your video cards, either.
The PCI-Express would be better than a normal PCI video card, but the cheapest PCI-E x1 video card I can find is running for $99.99, and the only PCI cards I can find are quite low-end, and you would probably not note that much of a difference in FPS.
Here's the $100 video card:http://www.newegg.com/Product/Product.aspx...N82E16814161197
When compared to the "normal" PCI-E x16 variant of that video card, you will see that that is simply EXPENSIVE for what it is.http://www.newegg.com/Product/Product.aspx...N82E16814102080