even though i own an evo... and think its an awesome car... You already have an STi... (a car that is comparable to the EVO in many aspects including the whale tail of a wing)
. Anyway, i'd seriously go for the porsche. Although it does require a little more maintenance, it really is timeless.
What model Porsche are you planning to get?
i have a 2 letter 1 digit suggestion.
....GT3