I would suggest that either of those are overkill for the use you are putting them to. Note that the X58 boards are designed to work with triple channel RAM so 6GB would be more effective. It would not cost much more to get faster RAM for the X58 system either.
An SSD as the OS disk would give you extra performance with one or 2 mechanical drives for data (and backup).
Have you got any systems in mind that you can link to?