Only get a PSU from Antec, XFX, Seasonic or Corsair. 500-600 watts will be plenty for your system.
Get 1600mhz RAM. If you are mostly gaming get only 8gb. Games only use 4gb. If you are editing videos then go for the 16gb.
Don't get a Western Digital Green drive. Its a slow storage drive. Get a WD blue or black.
You won't need a sound card unless you are recording and editing audio on a professional level.
You don't need an aftermarket cooler for the CPU because that CPU cannot be overclocked.