I plan with 100W per board since one board used 94W at 450MHz and 1.3V. So its a bit space for more wattage need. I originally wanted to use smaller psu's with 600W but realized, when 40 miners match into one 2U-Rack of 750mm depth and they use 4000W then i would need a lot psu's. So better safe some space by using bigger ones. The price is peanuts when compared to the costs of the miners so i think saving money there is saved at the wrong point.
I searched for tests and found that this model is said to have very stable power supply, it was marked on of the best. So i think its a good choice. Or do you have other info?
Nothing specific, no. I think Jonny couldn't test it as they didn't ship a US compatible version but it was described as being implemented as two 750W units back to back each with two 12V rails. Multiple rails really isn't a bad thing if you load them correctly. If I wanted that much power I'd look at actual twin PSUs which would give me some real redundancy. You could probably pick up two top brand proven design PSUs Gold or Platinum rated around the 700-800W mark for around the same outlay. The Thermaltake is quite a bit larger than standard PSU size, so you wouldn't lose as much space as you think.
It's your call!