Here's my take on this.
After burning up one of my "decent" power supplies and stressing my "good" power supply, I looked for alternatives.
A regular PC power supply is also working to generate 5VDC and 3.3VDC. We don't need these for an S1 with a pair of blades installed.
Since the Antminer S1 is only 12VDC input, I looked for a stable 12VDC power supply.
I picked up two Supernight LED Driver, 12VDC 30A power supplies, dialled them in to as close to 12VDC as possible (they are adjustable, one is at 12.00, the other is 12.02).
These have run cool and stable and I have my S1 OC to 393.75.
This is just on the bench, with a secondary 120mm fan drawing air out, and I'm peaking at 46* for temps.
The plan is to put a proper housing on them for cooling.
I've also put heat sinks on all of the ASIC chips and started putting them on the others but ran out (ordered more 6mm and 14mm heat sinks for the regulators and remaining small chips).
Heat sinks are like $25 per 100 count, so not so bad. I've used them on my U1s as well. I'll be resistor modding those soon and mounting them to a dedicated heat sink with cooling fan.
For less than $30 each on eBay, this may be an option for some of us.
The pair cost me a little under $56.
http://www.chaoticcrafts.com/Antminer%20S1/SDC12695.JPGhttp://www.chaoticcrafts.com/Antminer%20S1/SDC12696.JPGhttp://www.chaoticcrafts.com/Antminer%20S1/SDC12697.JPGhttp://www.chaoticcrafts.com/Antminer%20S1/SDC12698.JPG