Didn't you get a paint list with it?? I've only got the NX, but I remember it listing Clear blue, red and green and then steel and aluminum among others. I think there was a third metallic, maybe silver. I haven't done more then look it over and bought some paint at Hobby Lobby's last paint sale. As for the A, I think there is a metalic in the MM line that is white. That is your best bet. I don't remember what it's called, Magnesium maybe. For pictures try shiporama.org and startrek.com. If you want something specific, I can try to find it on DVD. I've got the movies and the first season of Enterprise I could look through if you need a better look at something. How's the A kit look?? I'm thinking about getting it for my birthday next month. I've heard good things and the NX and smaller kits are good and I figured it'd be more of the same.
Here's PL's NX Pics
http://www.playingmantis.com/pl/color/color.php
There isn't one for the A.