I don't know what your budget is or what motherboard availability is in the Netherlands, but I'd look at something like the Supermicro H8DIi series, which run about US$300-360 in the U.S. Supermicro makes a whole line of new Socket F boards, but most of the rest of them (H8DAi, etc.) cost US$400 and above.
The CPU you listed is a single-socket Opteron. It will run in less-expensive Socket AM2+ and AM3 boards, but you can only run one of them.
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