Yes kind folks it's this thread again! I am in a little bit of a hurry so I'll summarise:
I calculated my max system power draw at somewhere around 650-660w (with 100w headroom and mobo power consumption - ?)
EDIT: It seems that this may well be complete overkill. There's some question marks around this calculation. Later on I list actual components of my system|desktop.
I need a tier 1 850w (?) or 1000w PSU from the UK or Western Europe. I would prefer to use Scan, Ebay, or Amazon. It appears I have a ground loop problem with my current ageing 1000w PSU. Though that might not be the problem I'm experiencing some instability. Yesterday when I plugged in a USB Headphone amp and DAC the system blue screened. I had just also turned on an amplifier somewhere nearby electrically (on a nearby socket or extension kind of thing).
So it's for troubleshooting. As you can imagine I don't want to spend too much on it. There was a fancy looking EVGA 1000 G2 recently for under £90.
Hit me with your expertise!