You know, it drives me nuts when I hear people that plan on powering $1500 worth of hardware on a $50 PSU. After having power issues and problems for so long, and losing data on RAID 5 arrays because the PSU hiccups, I'll always be safe in that respect. Nothing is worth more than security in the realm of PSUs. So although my machine might only use 445 watts as measured with a Seasonic Angel, I'm glad to know that I've got 655 extra watts to play with if necessary.
Slightly OT, but I had to give my $.02.