I would buy an SSD. They are higher than a HDD, but they will drastically speed up boot time and load times. An SSD is one of the single best performance upgrades someone can make on a PC.
Why did you choose that power supply instead of the Gold rated one I have? I just would like an idea of why. Thank you.
that gpu will work fine with a 500watt bronze easily and that 520w bronze will be fine and its a good psu and will save you some money and you can spend it on a ssd too.