EVGA recently launched a new 500W power supply called the 500B. The new ATX PSU is haswell ready and supports the advanced low-wattage C6 and C7 sleep states. The 500B, as the name suggests, is a 500W unit rated 80 PLUS Bronze for 85% efficiency under typical workloads.
Although it is not modular, it has several other enthusiast friendly features. It supports 40 Amps on the single +12V rail and has over-current and over-voltage protection. Further, it has two 6+2-pin PCI-E power connectors, a single 8-pin CPU power, and a 24-pin ATX connector along with a couple molex and SATA power for good measure. Also, the PSU fan automatically adjusts speed for low noise.
The EVGA 500B (model number 100-BR-0500-KR) comes with a 3 year warranty. Pricing and availability have not been announced. It looks to be a decent option for budget builds, and should be priced competitively. More information and additional photos can be found on this EVGA product page.