For several rallies in 2000 Subaru used silver rims, Calatunya was one of those. I think the silver looks cool.
If you go the Portugal option you will need to raise the ride height a bit. I've got some suitable wheels you're welcome to. They are a bit scummy, a result of my early experiments into the compatability of Tamiya and Testors paints. With a bit of cleaning up they'll be fine. PM me if you're interested.