I just checked the psu and it doesn't look or smell out of the ordinary at all. I ordered an ASRock P77 Extreme4 that Newegg had on sale for $115 plus I got a Kill a watt meter. I've been looking up what HDD's draw on spin up, looking at max load values for similar machines here http://www.overclock.net/t/1126863/real-world-power-usage-user-submitted-values
, and looking at what other people with many hdd's have and recommend for psu's and it seems this TX750 should hold up just fine unless it's faulty. I have heard of staggered spin up, but those controller cards are really expensive and the drives have to support it too, seems pretty tricky to get working. When I get the new mobo I'm going to check how much the extra drives affect power usage on startup. I have a new 3TB WD green which is going to replace 2-3 more power hungry old drives, so the HDD's won't be pulling as much power as they have been.