Be quiet!'s Pure Power L8 700W is a decent mid- to high-end PSU that offers 80Plus Bronze certification and is produced by HEC (OEM). With the price of around US $100 it should not break anyones budget and still offer decent performance.
You do software updates to get the most from favourite programs right? Updating a motherboard BIOS can in a timely manner is also critical. The guide to Flashing a Motherboard BIOS spells out the often complicated steps in plain english. PCSTATS Tips