Enermax 660
Mine own experience with this mobo is that if you use all 4 RAM slots, the power demand goes way up... and it's already very high... with all 4 slots filled it's enough to sap common power supplies... I found this out early on building gemini(my best "common" power supplies couldn't even fire it up with 4 sticks) and look at how Gemini's power scheme came out as a result of my frustrations, lol...
Enermax 660 just for the mobo and main drives(I finally got this when I decided to quit messing around after 2 failed attempts to save money with lesser power supplies:~)... and a 300+300 to power everything else(optical/backup/fans/Koolance unit)... and marine battery backup to top it all off... lol... the first time I tried to fire the system it blew the breaker in the shop... and kept blowing it every time I tried, until I replaced the wore out 20amp breaker with a new 30 amp... lol, Gemini uses some current(electric bill went up $30-$50 this month, I'm turning things off now to try to compensate for it:~)... but the fun part is that in a little over a month we made it to the top 75 on the Overclockers.com SETI Boinc team...
I recommend the
Enermax 660... it's built for this mobo in my opinion... and it looks good to... very expensive, but if you're investing in a server/workstaion that you're going to be depending on, the power supply should the first order of busyness... even ahead of the CPUs/RAM... gotta start with a good foundation...
Good luck with your endeavor. :~)