I used to have a 94 gt vert that I sold and I bought an 04 STi so I'm a big fan of both.
I was in your same situation, I wanted a car that I could drive year round and not have to worry about the weather. From that perspective it was a good trade. That car was incredible in the rain and snow. I modded it to stage 2, which is approx 350/385 crank. It pulled pretty good and handled and stopped even better, it was a blast to drive. I will say the subaru community is great too.
I no longer have the car though, I got bored with the styling. There also was a lot of hate towards that car, but that had a lot to do with the wing. I swapped it out for a wrx wing and it subsided.
Things to consider, it is a 4 door car. The base rex isn't as raw an STi, so it will be a more "normal" car than your stang. The stang definitely looks better than the wrx. I never had anyone stare and compliment my STi like I had with my stang.
Also, don't expect to be doing many launches with a stock wrx tranny, you could probably manage a few, but it won't be happy with you long term. But start reading up and draw your own conclusions, check out nasioc.com
Ok, I'm rambling, but I will say, to this day I miss my mustang, I wish I never sold it. The suby was fun, I enjoyed my time with it, but I never had the same connection.
amnit:
