Newegg has the Rosewill Fortress 550W for $50 after MIR
on shell shocker today. Professional reviews are positive (should be for a 80 Plus Platinum Cert. PSU). Only caveat is that it's not modular. For the price, it's hard to complain. This PSU was on sale during black Friday weekend for the same price after MIR.
Main: i5-3570K, ASRock Z77 Pro4-M, Asus GTX660 TOP, 500GB Crucial BX100, 2 TB Samsung EcoGreen F4, 16GB 1600MHz G.Skill @1.25V, Silverstone PS07B
HTPC: A8-5600K, MSI FM2-A75IA-E53, 4TB Seagate SSHD, 8GB 1866MHz G.Skill, Hand-Built Wood Case