Mystichrome Cobra is a good choice, but that’s really the paint. The Terminator Cobra would also be a good choice, but I’d really just go with the one that I can buy, and wouldn’t have any problems driving all the time:
An S550 Mustang GT convertible - before the silly droopy headlight change.
I drove a red 2017 Mustang GT convertible through the Rocky Mountains over the course of a week almost 5 years ago now, and I still remember that fondly. Top down through the mountains, down the Icefields Parkway, was one of the best drives I’ve ever had. It was epic. When I got home, I bought a Miata instead of a Mustang because it was more fun at legal speeds - but I still think of that Mustang. A LOT. Enough that I’m wondering if I should just get both. My wallet is happy my garage couldn’t fit the two.
I’ve driven newer ones with the Ecoboost, and it’s just not right. I’ve driven older ones with the V6, and that was much worse. I’ve driven older ones with the V8, and they have the character, but much less livability.
That specific Mustang - right around 2017 - is pretty much perfect. Damn. I’m going to spend the day looking at Auto Trader now.
My hot take is that the pre-facelift S550 had the better front end, but the later cars have better tail lights. Someday I’ll mash those two together.