Hi Clicht,
I have replaced a standard battery with the Fullriver HC28 for much the same reason, also the price at less than $200.
I have had no dramas with the HC28 (unlike one Odessey I had about the same as the HC20) and was tempted by the smaller HC20 but the battery sales technician recommended HC28. I run a Odessey similar to the HC28 in my Subaru. The HC28 is apparantly rated well for the Polo.
Cheers Al
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