Well that mb is out of stock, temporary problem. I would check supermicros site, they should post a list of recommend ram. I would get recommend ram because these server boards can be a bit picky with the ram and it's nice to know it's gonna work. Even though the EVGA board will be alot of money I would not want to buy a 5520 tylersberg now. They have zero overclockability. The evga board will let you get much more out of the xeon 5520's (I'm assuming it will.) dual 5520's at stock hardly out perform a 4.2GHz i7. The only great advantage they have is they run cool and make a better 'office' computer than an OC'd i7.

Anyways your build list looks fine. I use an Asus z8pe-12 and non ecc corsair memory for my work computer and have had no issues with it. It runs cool and quiet and I crunch with it when I'm not using it at work.