You'll have to decide what it is you want to drive - and for how long. In ten years, whatever the WRX might be today, will be a ten-year-old-Subaru. Look around and see how many Roos you can find that are 10-15 years old with 200K+ miles, and whose coachwork is still screwed together. If you tend to not keep your cars long, the WRX would probably be a blast to own.
Good luck on your decision.