I used an external power supply because my box shouldn't make as less noise as possible.
After some research it was clear that I need additionaly a DC-DC converter.
The DC-DC converter uses the 12V input of the power supply and converts it to the power levels which are used by the mainboard (3.3V, 5V and 12V).
To choose the appropirate PSU for the hardware I used the follwowing calculator:
http://extreme.outervision.com/psucalculatorlite.jsp
When you look at my hardware list you may see that the DC-DC converter has more watts than the PSU. I did so because these 2 parts were the cheapest and it doesn't matter because the box needs only about 45 watts.
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