Well it sounds like you've done everything right.
So that's always good.
(Personally, I'd have probably Ghosted my old HD contents onto the new HDs, but that's because I hate reinstalling a million programs. M$ should really have a utility to copy an install over from an old HD.)
That really only leaves two concerns. It seems like your card is running hot, and your PSU doesn't look too peachy keen. Maybe the card is allowed to run that hot though, I'd check with the manufacturer. But your PSU ... if those are idle voltages, then it's possible that with the right load your system might not have enough power. Do you have any software to log your voltages so that you can see if they reach some critical point right before your system fails? Have you tried torture testing your PC with software like Prime95? The PSU should be enough, I'd think, but maybe it's defective. You never know. (Especially when quality companies like Antec are lately having disturbing quality control issues.)