500 watts is a popular segment these days. It's more than enough for powering an Ivy Bridge or Haswell CPU and a single mid-range or high-end graphics card. There's a lot of competition in the pricing in this segment. Spending money on a decent PSU is not a small part of the total price of building a capable PC system. For this reason manufacturers try to keep prices for their 500W PSUs as low as possible.
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