actually you don't have to spend $200 for a decent vid card upgrade, depending on your gaming needs, you can get away with a $50-100 model, or $150, or IF you want to spend $200 you can do that too...
but depending on what kind of Power Supply you currently have in the system, that may need to be upgraded as well, $50 for a decent PSU, & $50-100 for a good (budget/mid grade) gaming vid card.