Your board is capable of dual channel mode, which provides a significant performance increase without overclocking. But a lot of memory isn't that good for such applications. I'd suggest Crucial.com for stability, using the dual channel feature with matching modules in the first and third slot.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>