Thanks, both of you, for your answers! You're right, rising_star, I should definitely consider going it alone! I love driving and I might really enjoy it. I guess it depends how dependable my car is, based on mechanics' assessment? I might like driving alone, but probably not being stranded alone.
And as iphi brought up, I'm actually VERY attached to this car. I saved up for an Impreza of some sort and picked this one out! The RS is not a common car. That's why I'm considering an engine and drivetrain swap. It's for the sake of keeping my car and upgrading her the way I want to (I want a 6-speed,and my plan is to drop in an STi engine). It's not just for the trip!
Though that brings to mind another question: having a car in LA... Haha. My SO just bought a car, and we plan on living together, but a lot of apartments only have one parking space! I think I'd still take mine, though, and maybe sell it in LA before he moves out with me if it turns out we don't really need two and there's no way to get a second space.