MAC's website has a list of all of their shadow colors.

http://www.maccosmetics.com/templates/products/sp.tmpl?CATEGORY_ID=CATEGORY15103&PRODUCT_ID=PROD1 503

I would suggest getting either "Chrome Yellow" (if you want that like, "wow-my-eyeshadow-is-blinding" look), or going for a basic gold which can be layered up for a more bold color or swiped on lightly for a casual look. I actually love MAC's "Goldmine" shade. I use it when I'm going out to make my green eyes pop, and I think that gold is a universally flattering shade.

Experiment! The most you have to lose is $14.

Take care & have fun in Vegas!