CPU - I am with rolli59... 955BE for $115 + $30 CPU cooler + overclock to 3.6+GHz will be better for gaming than the X6 1055t. 955BE + stock CPU cooler and no overclock would still be better for gaming than the 1055t's 2.8GHz clock speed.
PSU - 500w is enough to power that system, but that PSU is OK at best. Antec, Corsair, XFX or Seasonic would be my choices...
GPU - Change that to the HD 6870. Newer card at the same performance level that should be about the same cost.
HD - Scratch the WD Green. The Samsung F3 1TB is a faster and more reliable drive.