I am reletivly new to building and upgrading computers. I was previously told that to get a decent gaming computer I could upgrade my psu and video card. Also I was told to replace my case. If someone could offer any advice on what psu, video card, and case I should get it would be greatly apperciated. I have a budget of $400 USD but would like to spend less if I can. I would also like to know if I should add an hdmi port to my computer since my new monitor has one and it came with an hdmi cord. If you need anymore information just ask.
The link for my computer specs is:
The link to my monitor is:
The link to my headset is: