cut the ram down to 8g make sure is good brand of 1600 speed at 1.5v or less.
try getting a ib cpu. even if it a non k chip. your going to get 10 percent speed over the older sb and get pci 3.0 speed on newer video card. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
the better heat sinks have a metal back plate or plastic back plate that locks those large cooler down better.
I would swap power supply brands. google the name and model of power supply in your price range and see if they been tested.
some brands are ok at low price some are not.