Last time I checked the eXtreme PSU calculator didn't address 12V1 and 12V2 wattage requirements. That's one thing I like about the OP's link. It clearly needs a little more work, but I think it deserves a second look in a few weeks.
HA! I love looking at these, reminds me of how little power I really need. I just bought a 550w PSU with 42A on triple 12v rails. This calculator says I need 180w at load. I knew my PSU was excessive! Oh well, it was a good price. It's hard to find quality 250-350w PSUs anymore.