The PSU is junk. Any time you see that little voltage select switch you want to change your PSU. Seeing as your not running a GPU and staying with onboard (good choice for a server btw.) any of the quality 350W or 380W units will be fine. If its a true server and will be left on for 24/7, you might want to get one that is 80+ bronze or better.
You might not need an x6 CPU. Depends on what your doing and how many servers your running.
Thanks for the advice.