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In general, the cheaper the better. That's how the radio was designed in the first place, and the design will accommodate a wide range without problem.
Having said that, replacing a 150V capacitor with a 500V unit isn't a good idea, as these type capacitors like to have nearly rated voltage applied. Otherwise they can get leaky and drift in capacitance quite a bit. So replace the 150V rating units with 150-200V rating.
The coupling and bypass capacitors are uncritical; the coupling capacitor actually determines the bass response, but those little speakers don't have bass response anyway.
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