Ever think about building your own system? If anything maybe you can get a comp with no video card, and then order one separately and put it in there. It is an ok system, but it is not meant for gaming. If there is anyway to get around that card, do it. Try to convince your dad to let you build your system. It really isn't that hard, and you'll get better performance for less money.
I looked at dell.com and i saw the options for the video cards.
I would say that get the Intel® Graphics Media Accelerator X3000 and then convince your dad to buy you a seperate card for $100 or so. the x3000 is integrated graphics, so its built into the motherboard. You can simply disable it, and then put a video card in.