When building on a budget, the EVGA 400W power supply is a great choice at a low cost. Supporting 30A on a single +12V rail provides more options without having to reduce your component requirements...
EVGA 500 White 500W 80Plus Power Supply. An Ultra Quiet Fan 120mm. Provides up to 40A/480W on the +12V Rail. Active power factor correction. Provides up to 500W at 40 degrees C. Intel Haswell...