Hello, I am a high school student and received a computer from my sister that needed some upgrades because I wanted to get into gaming on the computer. A HP Pro 3500 Series. It has 4GB (I purchased more RAM and now it has 8) and 500GB Hard Drive. Also a 300W power supply. It also has an Intel Pentium G870 3.1 GHz. The case is pretty big so I'm not worried about graphic card size, but I want a good graphics for middle-high settings for Black Ops 3. But since I am on a budget I want the best I can get for about 150 at most, but a bit more is fine. Thank you!