Julian,
The duty is based on the sale price paid for the vehicle being imported (not the original sale price new). Don't worry. Purchases made 6+ months before moving here are considered owned personal property and not subject to duty (as far as I know). The duty on imported cars is 6% (but might be lower for antiques — not too sure)
The red Florida car looks like a great deal even if you include the cost to get the red velvet out. Have it inspected and head to Florida! It's a long drive home, but there are lots of shipping companies (search the forum for recommendations). Good luck!
Mark
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