I have SSII as well, and wish it was more like millennium silver, but it's a very nice color nonetheless. I'd call it more of a blue-silver rather than silver-blue, but hides dirt almost as good, looks classy, it's a unique M color, and it's great for hot TX. But I'm glad I chose a black interior since the other choices don't match that well IMO.
Having said that, AW was a close second, and searched for cars on either color, but my SSII popped up first. Seems like you're on the same boat, so if you want to widen your prospects of finding a car (unless you're doing a special order), narrow down the options and let fate decide the color
. Can't go wrong with either one IMO. Good luck.