among THAT specific list, id pick the porsche without a second thought... besides that car though, id pick the M coupe.

350Z = nice, but interior is too plasticky for me
Z4 = nice, but too much of a chick's car
Mini = nice and fun, but i dont really like tiny cars
Miata = refer to Z4
C5 = nice and fast as hell, but ive never really been a big fan of corvettes
M coupe = i wanna be like samchoon