With the old 200w speakers you would need something with adequate output to avoid frying the magnets from under powering them. That's the way the old component speakers work with the amp matched to the max the speakers are rated for. Actually the more power worked even better like a 200w amp for 100w speakers!
For pc use there are plenty of 5.1 and 7.1 surround sound sets that will simply plug right into the jacks on the soud card without fuss! That would also eliminate the worry about possible feedback loops and other crap where you hear the humming and buzzong of the amplifier of an amp or receiver or other amplified device.
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