For the rest of the money, if you play large games, you can choose a graphics card. If you don't play games, you can use a processor with good performance to integrate the graphics card. I don't know if you have a 300W power supply. You can choose 350-400W if you want to upgrade your graphics card in the future. The brand is affordable.

The motherboard is a small board. Nothing will not affect the performance of other hardware, mainly depending on the performance of the processor and graphics card. You might as well save money and invest in graphics cards to get good game performance. You don't have a big budget. The graphics card can choose HD6770.

The power supply is absolutely reliable. Don't worry, just pay attention to the heat dissipation of the chassis.