Ok, I have read all of the material on break-in period for a new WRX. I found this interesting, and wanted to share it.
I just called my dealer to ask them if it's recommended to change the oil at 1k after the break-in, and the service rep said no. In fact, "don't worry about the break-in period". Come in for an oil change at 3750, and then at 7500. From there it will be oil changes at 7500 mile / 6 month intervals.
This dealer offers free oil changes and an "Engines and transmissions" for life guarantee, if the Subaru maintenance schedule is followed to the letter. They say, mentioned above, oil changes at 7500 / 6 months. And more comprehensive services at 15k (roughly 180$) and 30k (Roughly 600$) intervals.
I have to admit, I was surprised that they told me not to worry about the break in period!