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The advantage to using a standard microphone would be less noise. Computer mics are notorious for their noise levels.
What you are going to want is a Microphone Impedance Matching Transformer. It takes the low impedance source (the mic) and matches it to the high impedance source (ungrounded input). Preferambly you'll want one able to handle 250-50k ohms. Radio Shack should sell one -- jsut make sure you get one that has a female XLR end to a make 1/4" jack. You'll also need a adapter for the 1/4" jack to bring it down to the mini-plug on your sound card. Total cast shouldn't be any more than $20.00.
This is of course assuming your mic has a standard XLR end. If it just uses a 14" jack, forget about the matching transformer and just get the adapter plug. Now if you've got an old Shure or Audio Technica 2 prong XLR mic (threaded end), that's an entirely new problem.
-Craig
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