Recently the EPA has come up with a new 80 plus platinum but its currently only for 240V users. Here in the US and Canada we use 120V service which is not as efficient as the efficiency curve testifies.
Searching google found a single PSU that achieved it, for a high-end corporate server.
I have found a couple of 80 plus platinum models that can get there on 120V but they are out of my current budget.
The EPA has nothing to do with 80+, it wasn't created by them primarily because it is an international program. It was created and is run by Ecova. Currently 80+ titanium is only spec'd out for the redundant power supplies, but 80+ platinum exists in many 115V capable PSUs so im not really sure what this post is about other than another plug for your website which isn't even accurate.
Lets go for this line from your bit about 12 V being important:
"Some power supplies use 2 or more circuits. This is done to reduce costs as high current FET devices are very expensive. Our AK680 uses a pair of 20A circuits that provides the capacity to operate a single gaming card. We have seen some other models with 4 circuits. Load balancing is vital when using a multi circuit power supply."
First off, all of the 12 V power comes from a single source, rails do not imply sources, the only dual 12 V source PSU i know of is the HX1000 from corsair which was 2 500W PSUs in a single case, so multiple 12 V rails does not make it cheaper because they still need to use the same high current FETs to provide the source that the rails tap off of.
Also, use pictures of the PSUs that are the same as the ones you are referring to in the text, that page confuses the hell out of me when you keep referring to the AK680 which i see no pictures of a load table for.
There are shots of the internals of the HX1000 in the jonnyguru review, you will notice it is almost symmetrical because there is a 12V source on each side, it is old and discontinued now and the only multi 12 V source PSU i know of.
Actually the main reason for that is because they FUD a fair amount about single rail being more compatible, it really doesn't matter. It also lets them use a simpler controller with only 1 OCP sensor which lets them make it slightly cheaper, though some of their older models were multi rail. The HX 620 and HX520 were dual rail PSUs.
As for not needing to worry about adapters, any decent multi rail PSU is laid out well enough that you will not run into issues, as i already wrote in the post in my signature
"The lie in this scenario is that multi rail units have their over current protection(OCP) limits set such that you wont end up with trapped power, in this scenario the unit would likely have its OCP limit set at about 130W on each rail so that there would not be an issue of “trapped power”, this is why for most units with multiple 12V rails you cannot simply add the rails together to figure out the total power available from the 12V source, you must look at the total power listed for the 12V rails listed below them. On the units where the sum of the listed max currents for the 12V rails does add up to the stated limit of the 12V source the true current limits are usually set 3-5A(36-60W) higher than the label shows. With a modern power supply you are unlikely to overload any rail without using a large number of adapters and splitters to get more connectors, the manufacturer already spread the connectors across the rails so that it would be very unlikely for you to overload any single rail without trying pretty hard. "