Which do you pick, and why?
Or do you just wait for the C8? Or, what other ONE new car/truck do you buy with ~$60k?
I think I’d have to go GT350... Even though it’s “just” a Mustang, the design of the S550 always catches my eye and I’d never get tired of listening to it (and I can actually get all 3 kids into it). Never had been a “Mustang guy” prior to this generation. Definitely lust more after Porsches, in general, and current ride is an E90 M3 (which I love).
C&D just did a comparison test of these four and ranked them:
(spoilers below)

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4 - M2 Competition
3 - 718 Cayman
2 - Supra
1 - GT350