[slowcoach]

First off, since a few years ago all psu's available for sale in Europe have had to have circuit protection to protect the other hardware in the event of failure.

I have been using Win Power in my builds for years, I used to buy the best but found them noisy when under stress, the Win Power's are quiet and remain quiet.
I have the 850 watt model in my current rig which has an AMD 6 core, 8Gb Ram and 4 SATA drives, my case has 6 large fans.
The system is running 2 websites 24/7, running Linux for everyday use and Windows 2003 Server under VirtualBox for my software development, this system replaced 2 seperate machines which ran 24/7 for years with Win Power 550 watt psu's.
The main difference I found was that the expensive psu's had slightly longer leads and more connectors.

I bought 2 very expensive Corsair memory sticks with a lifetime warranty, both were slow and failed within 2 years, I replaced them with cheap memory sticks which had much more capacity and ran faster and they are still running 4 years later.
Price is what the seller thinks he can get, most things cost nothing to produce in comparison to the price charged.