If that's the car you always wanted and it's literally your hobby car, go for it. Not sure if you are going to buy it as a DD, i would think not, but i would keep the STI if that's the case. But then again, there is a guy here who is a Delorean nut who drives it every days to work haha. You just got to do what makes you happy.
P.S. if you plan on parting with your STI, let me know. I'm in the market