Don't have any pics of my new Mag 300C yet; but if you're thinking silver, have you thought about Satin Jade? It's like silver, but a bit richer. (None of the 'paint chips' in the brochure are really representative of actual color). I like my Magnesium; it's a dark-grey-green blend with a steel-bluish tint; depending on the light and angle you're looking at.
Here are some pics.
I own a magnesium 300c.
Picking a color was the biggest/hardest decision for me to make.
I kept flip floping between magnesium and black.
I actually like black better, but ended up picking magnesium for a change.
Magnesium is an interesting color because it changes color depending on the lighting. In my opinion, magnesium doesn't photograph very well and is best appreciated up close where you can really see the rich color.