Unless you need flat wire or some other special variation, radio shack speaker wire should be fine. Like the Monster Cable, it will be marked with a stripe or rib. Just make sure you hook positive (usually red) to positive. If you mess this up, don't worry - you won't hurt anything, the sound just won't be as good (due to phase inversion).
What you need to watch out for is bare wire ends. When you strip the wire to fit into the receiver and speaker, don't strip more than is necessary. Bare wire ends touching with current going through them can quickly (instantaneously) short an amplifier out. That really sucks.
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