For what it's worth, brand image and "class" mean exactly nothing to me, so that was nowhere on the map when I made my recommendation.
Unless you're the kind of person who likes to be surrounded by acres of steel and plastic when you drive, the Cayman should be more enjoyable more of the time than the Camaro. It's lighter, sharper, more agile, more involving, and still very driveable for long stretches.
Cost of ownership should be balanced against how rewarding the car is to drive. Yes, small differences in maintenance costs can get pretty big when you do a lot of miles per year -- but so can small differences in how much fun you have -- and with a Cayman, the difference in fun could be huge.