Well its really all dependent on personal taste. What looks s**t hot to me may look tacky to some one else.
But generally i tend to think Euro looking mags suit Astras very much. As opposed to powder coated, colored or other such mags that you see alot of on Japanese made cars. I was at one stage thinking of going the option of a bronze/gold or white rim on my car. But have finally decided on a gunmetal type finish. Looks tidier and a bit more classy on the car i think. (Yet to buy them...but they will be mine!)