A Q50 would be high on my list if they were still being made. When my wife had her QX60 in for service, we got a standard Q50 as a loaner, and even it was impressive. I also had a used 2005 G35 that I really liked.Infiniti Q50.
The 3 Liter twin turbo is quite nice and makes 300hp in "normal trim"
but is also available as a Red Sport version with 400 hp.
Lots of streetracers run these modified with more boost, on stock internals at 600 hp.
Same engine as in the new Z.
https://www.carmax.com/cars/infiniti/q50/red-sport-400
Man, I hate to see so many manufacturers jumping on the SUV-only train.
Not sure I want anything used, unless it's "certified used" like BMW dealers sell. BTW, used is the only way I could afford a C43!