Try Greg Norman or Black Opal Chardonnay. If they like sweeter wines, Penfolds Koonuga Hill Semillon Chard is great.
Another good choice for those who don't care much for reds would be a shiraz. It tends not to be as heavy as a cab or even some merlots. I like Black Opal Shiraz, or, if you want to go a little cheaper, Jacobs Creek.
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