STI limited with a Cobb stage 2 kit and call it a day. It doesn't have a crazy wing or overdone body work. It has leather seats and is more refined while still being track worthy. The stage 2 will take the car close to the 300whp range which is more than enough to take out 90% of the cars on the road.
Both cars rock, the EVO is easier to make power with, but I still prefer the STI. I see EVOs constantly, STI's are far less common. The power band is much more progressive and smooth compared to the EVOs and the stock clutch will last a bit longer. Plus I love the exhaust sound.