Hmm..I found a good PSU make a huge differnce..more stable performance and cooling
spend a bit more and consider a OCZ Powerstream 520w or Seasonic 500w..nonmodular
OCZ ModStream 520w is nice but not as good as the Powerstream PSU
these will set you back around $125 or less...$$$ well spent...and allow upgrades without worrying about the PSU
OCZ has 5 yr warranty also