Samsung spinpoint f3 1tb seems to be the popular choice for hdd here.
Also cooler master isn't well regarded in terms of their psu offerings. Go with antec, seasonic, corsair, xfx, pc power and cooling for psu. (adjust wattage depending on your gpu choice)
Okay I am going to change the psu to what you suggested.
But, changing the HDD to the one you suggested, will that make a speed difference in playing 3d games since I won't be doing any video or audio or photoshop editing. So what is the real benefit of getting the samsung HDD?