optimal Power Supply

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Hello everybody,

since I heard a lot about problems resulting from power supplies in gerneral
/ power supplies which had too little output for the respective system, I was
wondering if anyone knows an easy way to establish how powerful a power
supply for a given server system needs to be. Are there any recommendations?

How high would a power supply need to, for example, for a simple system with
the following spectifications:

Pentium IV, 3 GHz.
3 HDDs
1 SCSI Tape drive
CD/DVD Drive
external USB HDD
external Faxmodem

Thanks a lot in advance,

Tobias.
.