Seriously, No one has mentioned the 335i? I know it's not American, but an '08 335i with the twin turbo + chip = 370 HP.
Plus a nice, albeit utilitarian, interior.
Cars.com prices them in the mid twenties with 30k-60k miles depending.
I test drove a 981 Boxster S on Monday. I wanted to love the car but there was something missing for me. I don't think it was quite "organic" enough for me.
Congrats though! It's an absolutely beautiful car!