I have been planning to give myself a new video card for my birthday (in 2 weeks). After looking at the specs for games coming out in the next year, I decided I need to upgrade my processor as well. That would not be a problem, except that the chips my motherboard can accept are only slighly better than what I have. So I need a new motherboard, too. Eventually, I also want to add more memory.
I anticipate this taking about a year, just so I can space out the large purchases. (Graphics card - $200. Motherboard and processor - $300-400. Memory I'm not sure about.)