One thing about the Supratek is that they have a lifetime guarantee.
I expect the Cary sounds excellent. I own a Supratek Cortese, which is a higher priced model than the Chardonnay. It is wonderful.
You probably won't go wrong with either one.
You might enjoy paging through the old "Preamp Deal of the Century" thread. 26 million page views, over a period of about 20 years.