Which car?

I'd go with the Scion, everyone and their brother already has the Honda, and Scions have Toyota reliability, so that's not even an issue. With the Scion, you won't even have to install a lot of the parts yourself, since you can order the car wth a lot of them, so there's convienience right there, although you may be looking for somewhat higher performance parts than the Toyota dealer equipment, however the suspension work that you can have installed should be top notch.