How much RAM do you have currently? It looks like your board supports a maximum of 4GB. You still want to determine the wattage and connectivity of your power supply before getting a graphics card. That's very important.
Given the age of your other components and the budget for an upgrade, I think you are going to be best served looking on the used market. This is always a gamble and a risk, but if you are a savvy Ebay or Craigslist consumer then you can usually sus out which cards are well-cared-for cards being resold by individuals and which are ex-mining cards being sold by bulk resellers. Based on a quick scan through Ebay I am seeing cards like the GTX 1060 and RX 580 for under $100, and older cards even cheaper. Either of those would be more than enough for 2D games and Team Fortress.