I put the Blau CD72 San Francisco with the indash cd changer IDCa09 in mine after I took the Alpine CDA-9813 out. Looks MUCH better, sounds about the same, but the Blau is just easier to use and better made. The controls are easier to operate in a jiggly car.
You may want to consider the Los Angeles too. And last years model, the San Fran CD70 is available at really great prices, I just don't like the appearance.
You can find some photos of my setup at:
My STi homepage