The STi is by far the most performance value for your dollar. At roughly $100/horsepower, you will be challenged to find something else that competes (with the exception of the Mitsubishi EVO). This car is by far the most fun to drive of any turbocharged car I've owned. Running out of corners in 2nd gear with the All Wheel Drive will put a huge grin on your face every single time you do it. There are other performance cars out there such as the Nissan 350Z that are close. But the STi offers a standard cart-your-friends around 4-door (I carry both my kids car seats in mine) that you don't get with most sports cars. Bottom line is this car is a blast to drive, and is affordable.
All Wheel Drive performance and stiff suspension gives outstanding road grip. Plenty of utility and a practical daily driver. Acceleration is excellent in all gears. Leave *everything* else on the road behind when the pavement is wet.
Folding rear seats would be a huge improvement in utility and would allow you to carry a much greater variety of cargo. A good performance automatic transmission option would be great. Improved anti-sway bars to take out that tiny little bit of understeer. Automatic mode for the Intercooler Spray.